{
  "size": {
    "font": {
      "small": {
        "value": "12",
        "comment": "the small size of the font",
        "type": "fontSize"
      },
      "medium": {
        "value": "16",
        "comment": "the medium size of the font",
        "type": "fontSize"
      },
      "large": {
        "value": "18",
        "comment": "the large size of the font",
        "type": "fontSize"
      },
      "base": {
        "value": "{size.font.medium}",
        "comment": "the base size of the font",
        "type": "fontSize"
      }
    }
  }
}