Flexible motor RPM control for zhimi.airfresh.va2

Hi there!

I have zhimi.airfresh.va2 (XFXT01ZM). Can you add more levels to control motor’s RPM? (25% isn’t flexible for me). I’d like to choose RPM manually.

For example: 50% is too loud at night, and 25% not so productive… auto mode works awful out of the box.