Moods

[simbun]

In MinimServer everything comes from your tags/tagUpdate and there's no way around that, but you can use other tools to do - some of - the hard work for you e.g. When MinimServer introduced index artwork with v2 update 173, I had Plex index my collection and exported the Artist images for use in MinimServer.

I've just had a quick test and it appears that Plex pulls mood from AllMusic, and using WebTools NG it's possible to export that data, although in my sample data it seemed like it was better populated in the Artist table, so that's something you'd need to validate.
Once you have the data it should be relatively easy to build an Mp3tag script to add that data to your tags.

Similarly I've used the MusicBrainz database dump to add Album and Artist AllMusic URLs to my tracks so I'm able to go navigate there from BubbleUPnP (using the Comment.displayFormat functionality).

Were you looking for a more automated approach?