subst alias not mounted

[gcattan]

Hi,
I am using subst to associate a path (e.g. C:/test) with a drive letter (let's call it J:)
When I am starting my podman container, this letter is mounted under /mnt/j, but there is nothing under j.
(C:/test is correctly mounted under /mnt/c/test)

Is there a way to automatically mount everything under the alias J:/ to /mnt/j?