[2022] Sprays? This is embarrassing as hell to have to ask...

...but maybe there are others who are wondering too. I've got 2200 hours in the game, been playing since early access, which is to say I'm not a new player and can usually figure out PUBG's weird approach to keybinds. But for the life of me, I cannot figure out how to actually bind a key to use a spray (you know, like the spray paint thing). I've googled, I've spent what feels like hours squinting at the key bind screen, and still... no idea. I feel like an idiot, but: little help?