Indeed it’s not possible to do these things for albums that are not in the library. There is a chasm in Roon between library and non-library items that is unfortunate. However, it’s been much discussed and there are lots of existing feature request for this - it does not seem easy in the current architecture.
I am making an educated guess that doing all this not just for the local library but for 100 million albums in Qobuz and Tidal is simply not possible on a local NUC. In the long-running search thread there is a description by Roonlabs for why they moved search in the cloud and the massive infrastructure that would be necessary to run a local search engine instead. And cloud search in Roon is far from where it should be - they are still building it. I’d bet that all the neat library features for the whole streaming database will need a similar cloud investment - and time.
And the Qobuz section in Roon is just based on the Qobuz API, which I bet is severely limited and not at all suited to doing these things.
