Multiple displays at different resolutions in clone mode?

I have a 4K monitor and a 1080p monitor. I would like to clone the image on the 4K monitor to the 1080p monitor but when I put the displays in Clone mode, both the monitors run at 1080p.

Is there a way I can run the primary monitor at 4K and have the cloned image downscaled to 1080p by the GPU for the second monitor?

UltraMon software can do this except it only uses CPU so it’s very slow.

If this is not possible, how do I submit it as a feature request to Nvidia?