Lumetri Scopes focus area

Is it possible to focus the lumteri scopes to just a selected area of the frame?

Ie. I just want to see the scopes for an actor's face - I don't want the rest of the scene visible in the scopes.

If there is no such feature - can we make Lumetric Scopes work with Region of Interest?

It's the first thing I tried, I was surprised it didn't work. I think selecting a part of the frame with RoI should be reflected in the scopes.