Is there a way to make High Quality Dual Rendered Scopes?

As the title implies I’m trying to create Higher Quality Dual Rendered (Picture in Picture, 3D Scopes,etc.) in UE4, the ones that I’ve seen in UE4 are quite low resolution and don’t look anywhere near as good as something like Escape from Tarkov, if there is a way to create ones with a Higher Resolution that would be great.