Sunshine/src_assets/linux/assets/apps.json

{
  "env": {
    "PATH": "$(PATH):$(HOME)/.local/bin"
  },
  "apps": [
    {
      "name": "Low Res Desktop",
      "prep-cmd": [
        {
          "do": "xrandr --output HDMI-1 --mode 1920x1080",
          "undo": "xrandr --output HDMI-1 --mode 1920x1200"
        }
      ]
    },
    {
      "name": "Steam BigPicture",
      "output": "steam.txt",
      "detached": [
        "setsid steam steam://open/bigpicture"
      ],
      "image-path": "steam.png"
    }
  ]
}