Someone somewhere pointed me to Lidarr Extended which looks like it's been deprecated and moved to https://github.com/RandomNinjaAtk/arr-scripts/blob/main/lidarr/readme.md
I've got it set up, it works fantastically. The other important step is to get a Deezer ARL (there are various sources for this, or you can use your own, if you have one) and the accepts will crawl your Lidarr library every 15 minutes and download anything from Deezer that's available. It can also use Tidal or Qobuz, but credentials for those aren't as easy to come by as Deezer, and they all seem to have the same music available.
I, personally, just let it run. If you're looking for something specific, I use Deemix with the same ARL and download and import that specific album or artist