I’d imagine this is due to the song being released on albums - therefore if you search the song and find the albums it’ll tell you the quality on each one within the list.
Now, for trying to find the songs independently - you can do this. You’ll have to use the focus feature and then you’ll see the quality format tag. Be that; CD Quality, High-Res, etc.
But, it would be nice for ROON to display the format within the list. Which does happen, but it takes time - more info here on the matter.