Changing font used in Volumio / Now Playing plugin?

I have a lot of Japanese music in my library, resulting in a lot of tracks and artists having CJK characters. I’ve noticed multiple cases where there are missing letters in the font, primarily with names, and I’m wondering if there’s any way to change the font used to one that has the characters, or if there’s a way to add a fallback font.

Image to show what I’m referring to: