谷歌图表日历如何在-svg中用圆圈标记日期

<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>

var data = [
  ['Date', 'Label'],
  [new Date(2022, 0, 1), 'A'],
  [new Date(2022, 0, 5), 'B'],
  [new Date(2022, 0, 10), 'C']
];

<div id="calendar"></div>

google.charts.load('current', {'packages':['calendar']});

google.charts.setOnLoadCallback(drawChart);

function drawChart() {
  var chart = new google.visualization.Calendar(document.getElementById('calendar'));
}

chart.draw(data, {
  title: 'My Calendar',
  calendar: {
    cellSize: 20,
    yearLabel: {
      fontName: 'Times-Roman',
      fontSize: 32,
      color: '#871b47',
      bold: true,
      italic: true
    },
    monthLabel: {
      fontName: 'Times-Roman',
      fontSize: 12,
      color: '#871b47',
      bold: true,
      italic: true
    },
    dayOfWeekLabel: {
      fontName: 'Times-Roman',
      fontSize: 12,
      color: '#871b47',
      bold: true,
      italic: true
    }
  }
});