What type of content would it be, where race matters so much that you want to tag it?
A game that focuses on BIPOC experiences? You... realize that in too many countries people of color are marginalized minorities?
You could tag just about any anime game as poc.
If it's about Japanese people in Japan, no, you couldn't. (If it's about Chinese people in Japan, it actually might.) And nobody talked about tagging the exact race (well, "race") of the main character, just a general BIPOC tag.
Good point about the ambiguity of POC as an acronym. That's why I'm suggesting the form that's become popular on social media. But the request is legit.