I created a fork a GB Studio 2 that export natively game in pocket format.
https://github.com/BestPig/gb-studio#analogue-pocket-export
So it should be easy to port your game without the pain of migrating to GB Studio 3.0 if you have done it with GB Studio 2.0.
But you probably have done it with GB Studio 1.0, so I don't know if migrating to 1.0 -> 2.0 also break a lots of stuff.
If its not working, I still can port your game to Analogue Pocket manually if you want. Just tell me.