Is it possible to implement DRR (Dynamic Refresh Rate)?

[Albresky]

As is known to all, nowdays many modern LTPO monitors support dynamic refresh rate for saving battery. Technically, it's impossible to change refreash rate at signle Hertz level for LCD monitors, but it's trival to adjust the refresh rate at some candidate entries of refresh rate the LCD monitor natively supports. For example, my external monitor supports 165, 144, 120, 90, 75, and 60 Hz, then at software or driver level, we could dynamically adapt the refresh rate closest to the FPS reported by GPU. This technique is literally DRR. So, will we support this feature in BetterDisplay?

[waydabber]

This is something that requires low level support which is not present right now (except for the built-in displays of the MBP line-up).