Would it be possible to add support for Twithc?

Actually works. I don't know if it does anything behind the scenes though.

good for watching vtubers

Does exactly what it says it does. Takes the livestream chat messages and translates them in parentheses after the original message. Very useful if you watch vtubers and you like to keep an eye on the chat.

Update: Looks like it doesn't work on superchats.