Is your feature request related to a problem? Please describe.
OptiFine provides the feature of increasing the screenshot resolution, e.g. increasing it to 2x, 4x, etc. to provide better experience to, for instance, make wallpapers or other stuff.

Describe the solution you'd like
An option in the Video Settings that has "Screenshot Size"

Describe alternatives you've considered
A render resolution option? But that might not be so necessary

Would this be in the scope of Sodium? Or would be in, say, sodium-extra

There is already a mod called Fabrishot which has this feature. Sodium is really only meant to be an optimization mod, and if there's other mods which already add this, I don't see reason for us to reinvent the wheel.

OK, thanks!