No, unfortunately it does not do the trick. Also it made me wonder, why does an editor preference affect the final shipping content?
Edit: Now realized that the stretching only occurs with Fullscreen command. I have ran various tests and here are the outcomes:
Editor - Normal: Good quality, lower resolution due to viewport size
Editor - Immersive: Good quality, intended resolution due to native viewport size
Standalone - Windowed: Good quality, intended resolution if the window size is the same as native
Standalone - Fullscreen: Bad quality, intended resolution.
As a workaround during the screen capture I will switch to window mode, take the screenshot and switch back, however this part unfortunately needs a touch.