I don’t believe that’d allow you to use Audio Ranger, but maybe that someone who knows these things better than I do can help you there. Here is the MusicBrainz documentation on submitting.
One thing that would probably be of interest to you is “Using Picard’s “Add Cluster as Release” plugin: use your existing tags as a starting point for adding releases with the web interface.”.
The advantage of the MusicBrainz submission approach is that once it’s done, and, even better, if it’s done through Picard, is that not only will your bootlegs be “recognized” by Roon, but that anyone else, going forward, who runs those through MusicBrainz-compatible taggers will get their copies automatically tagged as well.