ECharts饼图指引线如何添加自定义圆点？

let echartData = [
  { name: 'A类', value: 3720 },
  { name: 'B类', value: 2920 },
  { name: 'C类', value: 2200 },
  { name: 'D类', value: 1420 },
  { name: 'E类', value: 3200 },
  { name: 'F类', value: 2420 },
  { name: 'G类', value: 2200 },
  { name: 'H类', value: 1420 },
  { name: 'I类', value: 3200 },
  { name: 'J类', value: 2420 }
];

option = {
  series: [{
    name: '下月应收件保费占比最高的产品',
    type: 'pie',
    radius: ['43%', '73.4%'],
    center: ['50%', '50%'],
    hoverAnimation: false,
    data: echartData,
    label: {
      normal: {
        formatter: (params) => `{icon|●}{name|${params.name}}\n{value|${params.value}}`,
        rich: {
          icon: { fontSize: 16, color: 'inherit' },
          name: { fontSize: 18, padding: [0, 0, 0, 10], color: '#000' },
          value: { fontSize: 14, fontWeight: 'bolder', padding: [10, 0, 0, 20], color: 'inherit' }
        }
      }
    }
  }]
};