Hide background media - transparency?

When you add a custom screen in the new presenter should the option "Hide background media" not hide the background and make it transparent rather than black, if not could we get an option for that especially in relation to streaming and obs.

The problem is presenter is, it is always going to show black in the background cause there is nothing behind it to show.

What are you thinking it would show behind in presenter for it to be transparent.

In OBS you could use a Luma key to get rid of the black background, this would also allow you to only reduce it but only a percentage and make it semi transparent.