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Not for everyone, but this does that perfectly well: https://wiki.termux.com/wiki/Termux-brightness

Pretty sure Macrodroid or Tasker can do this. In Macrodroid, I can set brightness to an integer 0-100 for brightness percentage.

Plus, on Pixels at least, there is a setting for Extra Dim (in accessibility settings) which can also probably be set via Macrodroid/Tasker. May need the ADB hack to allow system setting changes though.

hmm I'll try that. I realize now I may need 0-255, which I think is the native measurement in the API. I really do want a very small number over 0; on this Samsung tablet that's what looks right.

I've used the Automate app for doing exactly this, adjusting brightness to slightly above minimum if I set it too low

https://play.google.com/store/apps/details?id=com.llamalab.a...

I'm on the latest Android and there's an "Extra dim" button in the control center.