dotfiles/.config/waybar/modules/backlight.jsonc

{
  "backlight": {
    "device": "intel_backlight",
    "format": "{percent}% {icon}",
    "format-icons": ["", "", "", "", "", "", "", "", ""],
    "on-scroll-up": "swayosd-client --brightness +10",
    "on-scroll-down": "swayosd-client --brightness -10",
  },
}