I have read that Sailfish OS is working on support for the mark three, expected to be released in early 2022. Therefore I've bought a mark three device instead. The same question still holds: what does it take to add support for it?
I've also read a bit more of the guide, which seems to assume your devices is supported in LineageOS and TWRP, which it is not. Does that mean I'd first have to contribute support to TWRP and LineageOS?
I did see reports that people successfully run GSI on the device, so does that mean it should also work with the Gallium GSI?