How to have printer go to a specific height in z-axis on park?

[T9Air]

Hi, I am working on an error detector for my printer that uses movement in between pictures, but when using Park with timelapse, the extruder moves in the z-axis based on the layer height. This may cause the detector to think that the print moved, while in reality, it did not. How would I change the timelapse macro to enable it to move to a specific height no matter how high the extruder is?