Made of little things.

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$version": 4,
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "units": {
      "type": "string",
      "title": "Speed units",
      "description": "Speedometer units.",
      "enum": ["mph", "kmh"],
      "default": "mph",
      "x-napplet-section": "Display",
      "x-napplet-order": 1
    },
    "mirror": {
      "type": "boolean",
      "title": "Rear-view mirror",
      "description": "Show the rear-view mirror. Turning it off renders faster on slow devices.",
      "default": true,
      "x-napplet-section": "Display",
      "x-napplet-order": 2
    },
    "volume": {
      "type": "integer",
      "title": "Volume",
      "description": "Engine, siren, crash and traffic sound volume. 0 mutes the game.",
      "minimum": 0,
      "maximum": 100,
      "default": 70,
      "x-napplet-section": "Sound",
      "x-napplet-order": 3
    },
    "radio": {
      "type": "boolean",
      "title": "Police radio",
      "description": "Radio chatter from dispatch, the helicopter and other units (spoken by your system's voices, with subtitles).",
      "default": true,
      "x-napplet-section": "Sound",
      "x-napplet-order": 4
    },
    "traffic": {
      "type": "string",
      "title": "Traffic",
      "description": "How busy the highway is. Applies from the next pursuit.",
      "enum": ["light", "normal", "heavy"],
      "default": "normal",
      "x-napplet-section": "Gameplay",
      "x-napplet-order": 5
    }
  }
}