[arti_chaud]

I'm not sure if I understood your question, so here's a quick brief on how I handle this:

If the tag (from the path or the embedded metadata) is 'Compilation' or any other string specified in the settings, the album will have no main artist. Such albums cannot be grouped by series or sth (although that would be a great idea for version 4.0).

As of today, on the web app, there is no page that lists all 'compilation' albums.

Does it answer your question?

[lukasb]

Album Artist is essential for DJ mix albums, where each track has a different artist, but the album has a whole has a single artist.

[russelg]

Here's the typical use case for me: https://diversesystem.bandcamp.com/album/ad-garage

Typically with these, I put the Album Artist as "Diverse System" (this is the name of the "record label"). Each track will have it's own artist. In Jellyfin, there is an Album Artist tab inside a music library, which will group these albums into the Diverse System artist, and artists that only appear as a member of one of these albums will not appear in that tab (as they aren't the artist of an album).

So a bit different from a Compilation as you state it.

[arti_chaud]

This should be compatible, as a song's artist does not have to be the same as an album's artist. A song has to have an artist, an album does not. In Meelo, an artist that does not have an album but only songs would not be listed in a library's artist list for example.