The process is to search the currently supported models, and if your desired radio isn't listed, then see if it is among the 600+ current/outstanding requests:

If it is not listed there, consider creating an account on the chirp website and submitting a request, please also indicate if you have a suitable radio to loan/donate to a developer, or if you are able to assist the developer by testing updated software.

Ken, N2VIP

On Oct 19, 2022, at 16:11, Christopher Knowles <cknowles@tiac.net> wrote:

Does anyone know if there is a CHIRP file, or about to be a file, for
the YAESU FT-891? 73, Chris, WD1E