You can also do this with Lunar, or with the paid version of BetterDisplay, and they also support controlling external monitors via DDC/CI.

I personally despise MacOS, but the MiniLED displays in MacBooks have fully changed what I prioritize when buying displays.

It's so much more pleasant to be in a bright room (or outside), but that's only feasible if your screen can output like 1000nits of brightness which few can outside of MiniLED displays.