Manually controlling brightness intervals

KDE has an API to control display brightness. It is changeable, as the KDE Addon “control center”, mimicing macOS, is able to use 1% intervals.

Especially on Fedora the step between 0% and 5% is too big (logarithmic?) and I would like to change this and of course maks it public how that works.

Is there a lowlevel way or would it require deep system modifications? I cant imagine that, thinking that the addon works like that.