In Roon Track browser, there is no way to achieve this.
Maybe not at all-relevant for you, but maybe interesting anyway:
In Album browser, there is a way (albeit not for 100%) to only show the albums with track favourites.
Is is very important to understand that Qobuz present ‘Singles’ as Releases (i.e. Albums), so these do not show in favourite tracks.
As these are Qobuz favorites they are automatically added to your library, so the first thing to do is to Focus on Qobuz only.
Then you focus further on non-contiguous tracks - select Inspector- Contiguous tracks and click again to inverse.
You will now have a list of Albums with favourite tracks only. (In my (test)case the result is 1 album)
a) a track favorized in a Single album will not be available as the Single album is not shown
b) if in an album you have favorized only continguous tracks (say track 2 & 3) , the album will not be shown. (if you would have favorized tracks 2,3 & 5 the album would appear)
there are ways to refine this a little bit more playing with a limitation on the number of tracks, but not much of a difference)