Oh but I was asking if it's possible to convert Bitsy files to Mosi?
Viewing post in Convert image to tiles / room? Like Pixsy for Bitsy?
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.