Minimal display brightness

Hello everyone! Got the Chuwi Gemibook Pro and love it!

I have one issue: when I turn off light in my room at night I set brightness of display on minimum, but it still too bright. Is there any way to expand range of display brightness in lower end?

There is Intel Graphic Commander where I can adjust it a little, but I need solution without running software every time when I need it.

Thanks for answers!

I know F1 and battery saving will dim the screen more.