{
  "input": {
    "options": {
      "globalSeriesType": "heatmap",
      "colorScheme": "Bluered",
      "seriesOptions": {},
      "showDataLabels": false
    },
    "data": [
      {
        "name": "a",
        "data": [
          { "x": 12, "y": 21, "zVal": 3 },
          { "x": 11, "y": 22, "zVal": 2 },
          { "x": 11, "y": 21, "zVal": 1 },
          { "x": 12, "y": 22, "zVal": 4 }
        ]
      }
    ]
  },
  "output": {
    "series": [
      {
        "x": [12, 11],
        "y": [21, 22],
        "z": [[3, 1], [4, 2]],
        "type": "heatmap",
        "name": "",
        "colorscale": "Bluered"
      }
    ]
  }
}