Call XF86MonBrightnessUp and XF86MonBrightnessDown from terminal

I am running Qubes OS based on Fedora 36, and using i3wm. I am working on creating an i3 block similar to this contributed blocklet , but without using xbacklight. Why not xbacklight? My laptop has brightness increase and decrease fn keys (i.e., XF86MonBrightnessUp and XF86MonBrightnessDown) which work! I do not have xbacklight installed, and I do not want to install additional packages, because clearly my brightness controls work. 1) What I want to do is determine what command my XF86MonBrightnessUp and XF86MonBrightnessDown keys are sending (such that I could run it from terminal)? Using that, I will update my i3blocks script. I've tried using xev, but it does not seem to give me very useful info. 2) Would also be great if there is a way to determine current brightness level (again, without additional packages). Ideally, I want to control the brightness in a way that is most battery efficient, and I assume that's what XF86MonBrightnessUp and XF86MonBrightnessDown do already by default, and while not necessarily so with other packages.