Rectangular "Bubble"

I would like to be able to add a “speech bubble” or “caption” that is square with optional border (and a color picker for the border line) plus an option for no fill or fill of a given color (color picker).

One option might be to simply provide a square speech bubble.

In the overlay tool, in some places where there are color choices, a color picker is used that allows extensive options, but in other places only a couple of colors are available. It would be great to have the color picker available in all places where there are color options.

Thanks for the request, Paul. Our request process can only handle one request per one of these posts, so I’ve narrowed the topic to your first request here, for a rectangular bubble.