If we had tracksets
https://tickets.metabrainz.org/browse/MBS-6680
then the Folders could be expressed as names of tracksets.
Freso , in a discussion on available approaches to tracksets at
https://community.metabrainz.org/t/grouping-of-tracks-non-work-based-in-tracklist/152382
wrote,
"An option could also be to prepend e.g. track 1-7 with "Part 1: Medieval church music: " (or just "Medieval church music: "), track 8-9 with "Part 2: Medieval instrumental music: "(/"Medieval instrumental music: “), etc. I’ve seen this done elsewhere for similar track lists.”
So
Track 1 XTS001 (Action): Full Length: Into the fire
Track 2 XTS001 (Action): Full Length: Jump through the window
Track 3 XTS002 (Adventure): Full Length: Snake’s embrace
?