Possible to create a totally new keybinding in Cyberpunk?

Hello all,

So I built a new rig with some of the great CPU bundle deals that came along recently, and now I'm enjoying Cyberpunk with the absolutely glorious pathtracing+DLSS combo - thoroughly enjoying it. I've been customizing a lot of the keybindings to my exact preferences by editing the InputUserMappings.xml and UserSettings.json files and have been able to figure everything out except one.

I have installed a number of mods, one of which allows me to customize the first person driving camera to be much better for my setup. One thing I cannot change, however, is radio volume while I'm in the car.

So, I was wondering if it's possible to make a new keybinding that changes the CarRadioVolume setting in UserSettings.json up and down. Ideally, I'd bind it to my mousewheel so it would be like having a volume knob while I'm driving around. There are also some keybinds located in this same file, but they are a different type of value (a name) whereas the CarRadioVolume is an int value. I have not seen any other settings that are of the type I'm trying to make: a keybind that changes an int value up and down. If I did, I'd just try and copy that.

So, as someone very unfamiliar with programming, I was wondering if this is even possible to make a keybind for this without making a mod/extra script to do it? Or does the game's engine/logic have to already have this type of keybind built into it in order to edit it? Thanks in advance for any info!