Chris,
A request has been made for that model, but as of now there is no loaner radio available to send to our developers.
If you would offer a loan of your radio it would be greatly appreciated and if a developer accepts the request for making CHIRP work for the Yaesu FT-891, if you register using the link on the page bellow (upper right corner), you can offer your radio, which will be acknowledged by our development team and hopefully an interested dev will tackle this radio and call for you to send your radio to him on loan.
73
DR
N1EA