Roon only selects Tidal preferentially when it runs in Radio mode.
Any other selection YOU make. You select the Primary Version manually
I think the answer @RobOK is asking for is an automated import into library of currently MP3 versions.
The answer is as far as I know is no.
The (far from) easiest way is to use Album Focus Format to select for MP3 then create a Tag or preferably a Bookmark to keep them together . Then the slog of going album by album
Good luck