I posted my concerns about this a long, long time ago:
Not that Roon hasn’t made great strides in many areas. But Roon remains an information silo for true curators - no custom file-embedded metadata in or out.
This frustrates me because work has to be duplicated. We know that these custom tags are in the Roon database - you can see them in track properties - and it just wouldn’t be that hard to make Roon capable of focusing on them.
Love Roon, this is my biggest frustration with it.