Adding chapter markers to audio and video files

I'm currently researching how to embed chapter information inside audio and video files, so that they still work when playing a file standalone.
Can a chapter index be written to the ID3 metadata?

It's possible, but not with Mp3tag currently.

Hello! This question is good timing. I've got ~150-200 MP3s of a couple of radio series that I'm in the middle of sorting out. Each MP3 is an entire series containing ~6-10 episodes. I'd love to be able to write chapter info into them. I can see from above that it's not currently supported with Mp3tag, but is it on the roadmap?

Cheers, James