Thanks for the reply, I was able to take on my RetroArch overlays and use it.
But it seems that in DucksStation different games run at different resolutions/ratios so I can't just use a single overlays for everything.
This looks great on my 1080p monitor, thanks!
BTW, do you know if there are any tutorials on how to set up custom overlays? I can't seem to figure out what the values in the "Custom" tab do...