It’s just short for “bitmap font” yeah, there are MSDF and SDF variants. I’m not sure how to convert a WOFF to bmfont, but you can convert TTF files pretty conveniently here:
https://msdf-bmfont.donmccurdy.com/
…which is just running msdf-bmfont-xml in a Docker container. Ideally you convert only the characters needed for your app, to keep size down. But with English characters using the whole alphabet isn’t so bad.