Whiteboard Area Highlight

As a user, I want to insert images of a particular area of my whiteboard into my blocks. I want to be able to select an area, copy the reference_id of the area and paste the reference_id into a block for the image of the area to be inserted into the block.

The image of the area should update whenever I make changes on my whiteboard. Perhaps instead of area, I can select a collection of whiteboard elements, shapes, paths, text and generate a single reference id from that collection and render them as an image in a block.

I should be able to toggle to see the area highlights on an off in my whiteboard.