How to select a region in 'Draw', and overlay the region.

How can a region be selected within a jpg image that had been imported into a slide in ‘Draw’, and then have tthe selected region be overlayed with a tranparent layer having a different color?

“region selected within a jpg” is not possible. But you can draw a polygon on top of the image and set color and transparency for it. But it is not clear to me, what result do you want.