I want to use android studio as well, so I can costumize mine app further, but I can't figure out how either
imho this is not possible atm.
As far as i know C2 exports in html5 & javascript files . It then uses a wrapper to make this html5 page running on crossplatforms.
Android Studio is a IDE with an compiler, that compiles from java code.
only way would be to export your game as APK , decompile it and fix it to compile again in Android Studio