Was there a way to edit wfs code in koltin or android studio?
It is possible to extract watchface.xml (Watch Face Format) from wfs file and use it in Android Studio project but there is no way how to use it back again in WFS as there are other necessary things in the wfs project file.
But can you use android studio to link to the watch?
Of course you can 
It just needs some experience with adb
And experience not to curroupt the already buid watch face while editing
I only see json file in the wfs project.
The watchface.xml is one line