First i could not believe my Eyes! Nearly after one whole year there is a working solution! And this showas again, that HiDPI ist quite possible, only Apple is hurting his users! An thats really really sad! Here ist the solution via Betterdummy: https://www.macworld.com/article/549493/how-to-m1-mac-1440p-display-hidpi-retina-scaling.html

It's working since a few weeks, that you can read above 1 month ago, posted by @imagnity: "What worked for me on my Mac Studio (Should be similar for other M1/M2 devices): Boot your computer on Safe Mode. Now go to Displays under System Settings (Mac OS version below 13.0, it's System Preferences). Enable Scaled under Resolution and select Show all resolutions. You should now see many more HiDPI options. Choose the one you like. Afterwards, just restart your computer. That's it!"

Crazy Shit! Since Ventura 13.2 Apple get the Miracle: without supporting Hardware and without any 3rd Party Software, you can set HiDPI-Resolutions in the Systempreferences!