This is still relevant I think :) What you mentioned is very similar to an edit decision list (EDL [1]), of which I only learned recently. I had a feature request [2] to support EDL as an ouptut format, and upon further investigation, it seems like the format is very similar to what you're talking about. The Wikipedia page also indicates that VLC supports xspf files, but I haven't done much research into that yet ("XML Shareable Playlist Format").
[1] https://en.wikipedia.org/wiki/Edit_decision_list
[2] https://github.com/Breakthrough/PySceneDetect/issues/101