The highlight rule(s) have already been created in Tags (2). And they appear as expected in Album view and Track Details view. They do not appear on the artwork in Album and Tracks view. And yes, "highlight" is set in the Album and Tracks configuration. The highlight does show on the details part of the view, but no on the artwork.
Note the green highlight in the upper right corner of these albums:
Note that it's not showing on the artwork in Albums and Tracks.