There's currently a discussion happening between Mobian developers on whether to stick with phosh-osk-stub as a keyboard or switch back to squeekboard (which was replaced after having been removed from Debian testing for a while).
If you feel one option is a lot better for you than the other, let us know at https://salsa.debian.org/DebianOnMobile-team/meta-phosh/-/merge_requests/38
@mobian I just want a working keyboard to type in Chinese, Japanese, and other languages without Latin characters !