GOSSIP works with Asian language fonts as the underlying system (Scribble) allows for such. A hurdle I had in getting set up properly was getting these characters to be properly read and rendered by Gamemaker directly, and that involves some steps.
Make sure you’ve created an appropriate texture page with all the characters needed, set up the font in Gamemaker to use those characters and of course use a compatible font. I’m using “NOTOSANSJP”.