How to plot multiple pie charts with Apache ECharts using dataset and source

I have a dataset like this:

Headers Array:

["a", "b", "c"]

Data Array:

[[5, 5, 5],
[10, 20, 30]]

I want my chart to look like the chart below, but I prefer not to pre-process the data. Is it possible to user dataset and source and avoid pre-processing? There is a related Q/A in the site but I wasn’t able to get it working in this particular case.

option = {
  series: [
    {
      type: 'pie',
      radius: '100',
      right: "300",
      data: [["a", 5], ["b", 5], ["c",5]],
      encode: {value: 1},
      label: {formatter: "{@[0]}: {d}%"}
    },
   {
      type: 'pie',
      radius: '100',
      left: "300",
      data: [["a", 10], ["b", 20], ["c", 30]],
      encode: {value: 1},
      label: {formatter: "{@[0]}: {d}%"}
    },
  ]
};

let myChart = echarts.init(document.getElementById('main'));
myChart.setOption(option)

<html>
  <body>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/echarts.min.js"></script>
    <div id="main" style="width: 700px; height:400px;"></div>
  </body>
</html>