Automatic Stream aspect ratio resize feature

I would love to see an automated resizing for video streams, so that a stream with the size of 4:3, 5:4, and all the other aspect ratios stay that ratio in the small pop-out overlay and the own pop-out window and is not being forced into a 16:9 ratio, this would be very helpful for stream from mobile discord as that currently takes up 2/3 on the screen with useless black/gray bars as well for desktops that are being run in a vertical mode instead of the normal horizontal mode. An example for that would be YouTube's automatic feature to use the ratio in which a video was uploaded instead of forcing it to 16:9 with extra bars at the sides.

Picture 1: example on how the window should be sized without black bars at the side or top with the stream filling up the whole window. Could later on even remove the other black bars if possible.

Picture 2: how the stream currently looks on the pop-out window.

Picture 3: how the stream currently looks on the overlay.