{
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    "options": {
      "globalSeriesType": "pie",
      "textFormat": ""
    },
    "series": [
      { "name": "a" }
    ]
  },
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    "layout": {
      "margin": { "l": 10, "r": 10, "b": 10, "t": 25, "pad": 4 },
      "width": 400,
      "height": 300,
      "autosize": true,
      "showlegend": true,
      "annotations": [
        {
          "x": 0.49,
          "y": 0.985,
          "xanchor": "center",
          "yanchor": "top",
          "text": "a",
          "showarrow": false
        }
      ]
    }
  }
}