Change scaling/resolution of primary monitor from bash/terminal

[tavk (T-vK T-vK)]

I made a Gnome Extension out of this now:

GitHub - T-vK/ScaleToggle: Adds a toggle to change the display scaling of the...

I already submitted it, but I guess it needs to be reviewed before becoming visible:
https://extensions.gnome.org/extension/4794/scaletoggle/