diff --git a/packages/react-native-codegen/src/CodegenSchema.d.ts b/packages/react-native-codegen/src/CodegenSchema.d.ts
index 2c33b098ea4dbf..3482172d99009f 100644
--- a/packages/react-native-codegen/src/CodegenSchema.d.ts
+++ b/packages/react-native-codegen/src/CodegenSchema.d.ts
@@ -295,6 +295,7 @@ export interface NativeModuleEnumDeclarationWithMembers {
 
 export interface NativeModuleGenericObjectTypeAnnotation {
   readonly type: 'GenericObjectTypeAnnotation';
+  readonly dictionaryValueType?: Nullable<NativeModuleTypeAnnotation> | undefined;
 }
 
 export interface NativeModuleTypeAliasTypeAnnotation {
diff --git a/packages/react-native-codegen/src/CodegenSchema.js b/packages/react-native-codegen/src/CodegenSchema.js
index 08b551a9a47e12..f05a4f2e749ab3 100644
--- a/packages/react-native-codegen/src/CodegenSchema.js
+++ b/packages/react-native-codegen/src/CodegenSchema.js
@@ -328,6 +328,11 @@ export type NativeModuleEnumDeclarationWithMembers = {
 
 export type NativeModuleGenericObjectTypeAnnotation = $ReadOnly<{
   type: 'GenericObjectTypeAnnotation',
+
+  // a dictionary type is codegen as "Object"
+  // but we know all its members are in the same type
+  // when it happens, the following field is non-null
+  dictionaryValueType?: Nullable<NativeModuleTypeAnnotation>,
 }>;
 
 export type NativeModuleTypeAliasTypeAnnotation = $ReadOnly<{
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-snapshot-test.js.snap b/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-snapshot-test.js.snap
index 6de97cbbc6b47a..00d66fd81de929 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-snapshot-test.js.snap
+++ b/packages/react-native-codegen/src/parsers/flow/modules/__tests__/__snapshots__/module-parser-snapshot-test.js.snap
@@ -201,14 +201,26 @@ exports[`RN Codegen Flow Parser can generate fixture CXX_ONLY_NATIVE_MODULE 1`]
             'typeAnnotation': {
               'type': 'FunctionTypeAnnotation',
               'returnTypeAnnotation': {
-                'type': 'GenericObjectTypeAnnotation'
+                'type': 'GenericObjectTypeAnnotation',
+                'dictionaryValueType': {
+                  'type': 'NullableTypeAnnotation',
+                  'typeAnnotation': {
+                    'type': 'NumberTypeAnnotation'
+                  }
+                }
               },
               'params': [
                 {
                   'name': 'arg',
                   'optional': false,
                   'typeAnnotation': {
-                    'type': 'GenericObjectTypeAnnotation'
+                    'type': 'GenericObjectTypeAnnotation',
+                    'dictionaryValueType': {
+                      'type': 'NullableTypeAnnotation',
+                      'typeAnnotation': {
+                        'type': 'NumberTypeAnnotation'
+                      }
+                    }
                   }
                 }
               ]
@@ -220,14 +232,20 @@ exports[`RN Codegen Flow Parser can generate fixture CXX_ONLY_NATIVE_MODULE 1`]
             'typeAnnotation': {
               'type': 'FunctionTypeAnnotation',
               'returnTypeAnnotation': {
-                'type': 'GenericObjectTypeAnnotation'
+                'type': 'GenericObjectTypeAnnotation',
+                'dictionaryValueType': {
+                  'type': 'StringTypeAnnotation'
+                }
               },
               'params': [
                 {
                   'name': 'arg',
                   'optional': false,
                   'typeAnnotation': {
-                    'type': 'GenericObjectTypeAnnotation'
+                    'type': 'GenericObjectTypeAnnotation',
+                    'dictionaryValueType': {
+                      'type': 'StringTypeAnnotation'
+                    }
                   }
                 }
               ]
@@ -2165,7 +2183,11 @@ exports[`RN Codegen Flow Parser can generate fixture PROMISE_WITH_COMMONLY_USED_
               'returnTypeAnnotation': {
                 'type': 'PromiseTypeAnnotation',
                 'elementType': {
-                  'type': 'GenericObjectTypeAnnotation'
+                  'type': 'GenericObjectTypeAnnotation',
+                  'dictionaryValueType': {
+                    'type': 'TypeAliasTypeAnnotation',
+                    'name': 'CustomObject'
+                  }
                 }
               },
               'params': []
diff --git a/packages/react-native-codegen/src/parsers/flow/modules/index.js b/packages/react-native-codegen/src/parsers/flow/modules/index.js
index 1b7b2503f70d25..75352fea2bf67e 100644
--- a/packages/react-native-codegen/src/parsers/flow/modules/index.js
+++ b/packages/react-native-codegen/src/parsers/flow/modules/index.js
@@ -32,7 +32,7 @@ const {
 const {
   emitArrayType,
   emitFunction,
-  emitGenericObject,
+  emitDictionary,
   emitPromise,
   emitRootTag,
   emitUnion,
@@ -152,7 +152,7 @@ function translateTypeAnnotation(
           // check the property type to prevent developers from using unsupported types
           // the return value from `translateTypeAnnotation` is unused
           const propertyType = indexers[0].value;
-          translateTypeAnnotation(
+          const valueType = translateTypeAnnotation(
             hasteModuleName,
             propertyType,
             types,
@@ -163,7 +163,7 @@ function translateTypeAnnotation(
             parser,
           );
           // no need to do further checking
-          return emitGenericObject(nullable);
+          return emitDictionary(nullable, valueType);
         }
       }
 
diff --git a/packages/react-native-codegen/src/parsers/parsers-primitives.js b/packages/react-native-codegen/src/parsers/parsers-primitives.js
index 849c3e756fb0b5..84ba85949d5e1a 100644
--- a/packages/react-native-codegen/src/parsers/parsers-primitives.js
+++ b/packages/react-native-codegen/src/parsers/parsers-primitives.js
@@ -309,6 +309,16 @@ function emitGenericObject(
   });
 }
 
+function emitDictionary(
+  nullable: boolean,
+  valueType: Nullable<NativeModuleTypeAnnotation>,
+): Nullable<NativeModuleGenericObjectTypeAnnotation> {
+  return wrapNullable(nullable, {
+    type: 'GenericObjectTypeAnnotation',
+    dictionaryValueType: valueType,
+  });
+}
+
 function emitObject(
   nullable: boolean,
   properties: Array<$FlowFixMe>,
@@ -576,6 +586,7 @@ module.exports = {
   emitInt32,
   emitNumber,
   emitGenericObject,
+  emitDictionary,
   emitObject,
   emitPromise,
   emitRootTag,
diff --git a/packages/react-native-codegen/src/parsers/typescript/modules/__tests__/__snapshots__/typescript-module-parser-snapshot-test.js.snap b/packages/react-native-codegen/src/parsers/typescript/modules/__tests__/__snapshots__/typescript-module-parser-snapshot-test.js.snap
index 6f7033c94407af..870a93494166d8 100644
--- a/packages/react-native-codegen/src/parsers/typescript/modules/__tests__/__snapshots__/typescript-module-parser-snapshot-test.js.snap
+++ b/packages/react-native-codegen/src/parsers/typescript/modules/__tests__/__snapshots__/typescript-module-parser-snapshot-test.js.snap
@@ -199,14 +199,26 @@ exports[`RN Codegen TypeScript Parser can generate fixture CXX_ONLY_NATIVE_MODUL
             'typeAnnotation': {
               'type': 'FunctionTypeAnnotation',
               'returnTypeAnnotation': {
-                'type': 'GenericObjectTypeAnnotation'
+                'type': 'GenericObjectTypeAnnotation',
+                'dictionaryValueType': {
+                  'type': 'NullableTypeAnnotation',
+                  'typeAnnotation': {
+                    'type': 'NumberTypeAnnotation'
+                  }
+                }
               },
               'params': [
                 {
                   'name': 'arg',
                   'optional': false,
                   'typeAnnotation': {
-                    'type': 'GenericObjectTypeAnnotation'
+                    'type': 'GenericObjectTypeAnnotation',
+                    'dictionaryValueType': {
+                      'type': 'NullableTypeAnnotation',
+                      'typeAnnotation': {
+                        'type': 'NumberTypeAnnotation'
+                      }
+                    }
                   }
                 }
               ]
@@ -218,14 +230,20 @@ exports[`RN Codegen TypeScript Parser can generate fixture CXX_ONLY_NATIVE_MODUL
             'typeAnnotation': {
               'type': 'FunctionTypeAnnotation',
               'returnTypeAnnotation': {
-                'type': 'GenericObjectTypeAnnotation'
+                'type': 'GenericObjectTypeAnnotation',
+                'dictionaryValueType': {
+                  'type': 'StringTypeAnnotation'
+                }
               },
               'params': [
                 {
                   'name': 'arg',
                   'optional': false,
                   'typeAnnotation': {
-                    'type': 'GenericObjectTypeAnnotation'
+                    'type': 'GenericObjectTypeAnnotation',
+                    'dictionaryValueType': {
+                      'type': 'StringTypeAnnotation'
+                    }
                   }
                 }
               ]
diff --git a/packages/react-native-codegen/src/parsers/typescript/modules/index.js b/packages/react-native-codegen/src/parsers/typescript/modules/index.js
index d9e20011a181a3..6123cf4321a736 100644
--- a/packages/react-native-codegen/src/parsers/typescript/modules/index.js
+++ b/packages/react-native-codegen/src/parsers/typescript/modules/index.js
@@ -35,7 +35,7 @@ const {parseObjectProperty} = require('../../parsers-commons');
 const {
   emitArrayType,
   emitFunction,
-  emitGenericObject,
+  emitDictionary,
   emitPromise,
   emitRootTag,
   emitUnion,
@@ -309,7 +309,7 @@ function translateTypeAnnotation(
           // check the property type to prevent developers from using unsupported types
           // the return value from `translateTypeAnnotation` is unused
           const propertyType = indexSignatures[0].typeAnnotation;
-          translateTypeAnnotation(
+          const valueType = translateTypeAnnotation(
             hasteModuleName,
             propertyType,
             types,
@@ -320,7 +320,7 @@ function translateTypeAnnotation(
             parser,
           );
           // no need to do further checking
-          return emitGenericObject(nullable);
+          return emitDictionary(nullable, valueType);
         }
       }