I'm really interested in this feature - I have no hearing impairment, but with most colds, I get extremely long-lasting & severe laryngitis to the point where I'm effectively mute for a month at a time afterwards (though this hasn't been an issue since the pandemic started because I've been in isolation and not gotten sick). Prior to the pandemic I was actually considering learning some ASL to be able to communicate when I have laryngitis but this seems like a much easier solution. For phone calls, I could have a brief preset message explaining the situation and that I will be typing my responses and using TTS, and then I'm able to use the phone again. This looks fantastic!
Are you planning to release an android version?