[chirp_users] How to analyse the memory map for a new radio type?

I am a new Ham, and I foolishly selected a radio that is not supported by CHIRP. (Yaesu FT-4XR). I wish to add support for it and its recent Yaesu siblings. I have successfully analysed the serial protocol and I can read and write the memory, but I don't know what to do next. Is there a HOWTO somewhere? If not, I can attempt to create one, but some guidance would be appreciated.