Adding frames to one part within a score

I'd love a feature that allows you to add a frame to just one part within a score.

I prepare scores for a lot of amateur ensembles which include, e.g. ukulele and guitar. Including the chord diagrams for every chord can really add to the page count, but it's incredibly helpful to have, e.g. the ukulele chord diagrams on the the ukulele part and guitar diagrams on the guitar part, while only having the chord symbols on the other parts.