{
  "input": {
    "options": {
      "globalSeriesType": "pie",
      "textFormat": "{{ @@name }}"
    },
    "series": [
      { "name": "a" }
    ]
  },
  "output": {
    "layout": {
      "margin": { "l": 10, "r": 10, "b": 5, "t": 20, "pad": 4 },
      "width": 400,
      "height": 300,
      "autosize": false,
      "showlegend": true,
      "annotations": []
    }
  }
}