[NoGravitas]

I'm reasonably sure that Jellyfin could handle this setup. For music, it normally uses in-file metadata, but lacking that, I think you can give it enough info through paths and filenames for it to look up the metadata online (this is what it does for movies and TV shows). It definitely uses a text-based metadata format (.nfo) internally to cache this metadata, and it probably would be easy to programatically convert your metadata file to this format.