Restore System Default Brightness to a light.

[claytonium13]

In Fully, you can set the brightness to 0-255 or set the field to empty to use the system default. Using the system default is nice because the screen (Fire HD 10) will automatically dim as the ambient light changes. However, sometimes I want to increase the brightness but I'm unable to find a way to restore it to the system default afterwards without going into Fully. Is there a way to send a "null" value from Home Assistant to Fully Kiosk?

[DanDixon]

I'd also like to see something like this.
A way to restore/turn-on "adaptive brightness" would be great.