Display scaling on ultra-wide dsplays

Hello,

I've got an LG 35" ultra-wide display (35WN75C-B) connected to my MBP 16" through DisplayPort via a Caldigit TS3. All is fine, picking up 3440x1440 resolution with 21:9 aspect ratio.

But for someone like myself who doesn't have the best eyesight, the fonts are just a bit too small to be comfortable. I was hoping I could just go into System Preferences -> Display -> Scaled and be presented with the "Larger Text" to "More Space" options. But instead, it gives me a list of screen resolution and even if I Option-click and show all possible resolution options, there isn't one option that will give me the ideal font size. It's either too small or way too big. There is a 1600x1200 that actually gives me the font size I want however, this is not 21:9 so pointless for the ultra-wide screen!

Why do I not get the "Larger Text" to "More Space" options i.e. scaling? I'm certain that if it gave me this, I can just select either "Larger Text" or the selection next to it and that would give me the ideal scaling.

And for comparison, I'm running Windows 10 virtual machine under Parallels. And when I go full screen, I can select Windows display scaling and adjusting it to 125% gives me the perfect font sizes.