As someone who listens to a lot of niche artists, I was upset, that not all albums were present in MusicBrainz. So I came up with a solution.

Meet Lidarr++Deemix!

https://github.com/ad-on-is/lidarr-deemix

This tool helps to enrich Lidarr, by providing a custom proxy, that hooks into the process without modifying Lidarr itself, and injects additional albums from deemix.