That functionality already exists, but focus is only for content in your library. So it doesn’t help with TIDAL.
For “for purchase” files there are supposed to be. In practice this is hit or miss. Many publishers screw it up.
For TIDAL streaming content, every file I’ve ever laid eyes on had no tags whatsoever.
The right mechanism for detecting an MQA stream is to pass the stream to some code provided by MQA that determines what it is. That will happen as part of Roon’s more comprehensive MQA integration.
I wish TIDAL made it easier to find MQA content via their API. Unfortunately, one of the side effects of making MQA “just a special FLAC file” is that it’s very, very easy to treat it that way and not build all of these other features around it, as TIDAL have apparently done.
The “masters” tab (as many have discovered) doesn’t contain all of the MQA content that TIDAL has–it’s delivered via the editorial mechanisms that drive “What’s New”, so clearly a human is populating those manually. As far as we know there is no generic way to find out from TIDAL which content is MQA programmatically other than playing each track one by one, which clearly isn’t practical.