I LOVE Mosi so much that I can't get back into vanilla bitsy, but I would love to be able to convert images and add it to my game. Is it possible to somehow make bitsy data compatible or somehow import an image?
Yes, but it would require a third-party tool to convert Bitsy files to Mosi. You'd need to parse the Bitsy file format (most of the third-party Bitsy tools already do this, and I think at least some are open source - Mosi itself already parses Bitsy font files which are a similar data structure) and then convert the data and output some stringified JSON.