Turn off monitor backlight (DPMS) from a VC/VT (TTY) without Xorg/Wayland-DE

How does one flip a monitor's backlight on/off from the normal Linux console (tty1)? I'm looking for a way to do this without dependencies on Xorg or specific Wayland-Compositors. Let's say, that I want to toggle the backlight of the monitor connected to

/sys/class/drm/card0-HDMI-A-1

. EDIT: Putting a specific monitor into standby mode from tty1 would suffice as an answer.

seems to work, but there doesn't seem to be a way that affects just one specific monitor instead of all of them.

setvcp D6 x05

let me turn off one of my monitors. Again, how does one select which one with these tools?