I've noticed that you can have chapters in your FLAC files if you tag like this:

CHAPTER001=00:00:00.000
CHAPTER002=00:00:46.000
CHAPTER003=00:01:52.000
CHAPTER004=00:02:33.000

See https://wiki.xiph.org/Chapter_Extension

This is great for instrumental/classical music with very long tracks. I've tagged some of my FLAC files with chapters and it works in MPC-HC but not in Asset nor in Foobar.

So I wonder

1. Are chapters supported by UPnP?
2. Could chapters be implemented in Asset?
3. Does anyone use chapters in FLAC (or in other files with Vorbis comment)? Or know about players or servers that support chapters in FLAC?