By using Shapr I become an expert at utilizing various workarounds!
Essentially the image resolution you get is just based on your screen resolution, if you have HD monitor you get HD image from Shapr. If you have Apple 5k XDR monitor or better yet an 8k monitor you get 8k image.
So the workaround is getting an 8k monitor 
. Other option is using a virtual display and set it at 8192 x 3456 the MAX.
Here is what that looks like.
