Setting Brightness Below Minimum on Wayland

I use a Dell XPS 9520, and the manufacturer-specified minimum brightness (when /sys/class/backlight/intel_backlight/brightness is 1) is simply way too bright and hurts my eyes in a dark environment. When I was using X11, I was able to work around this using xrandr to artificially reduce the brightness below the minimum. For example, the below command would set the screen to 40% brightness, multiplying the effect of normal brightness controls.

xrandr --output eDP-1 --brightness 0.4

However, xrandr does not work on Wayland and I have been unable to find anything to replace this functionality. The screen also does not support DDC/CI controls for programs like ddcutil. And if it's relevant, I'm using KDE Plasma 6.3 on NixOS. Is there any way to reduce brightness below the minimum on Wayland?