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Add star icon on candlestick Google Chart

I'm trying to add a star icon to candlestick chart with Google Charts api, but I'm having difficulty. If anyone can help me:

I saw it working on this google page: https://developers.google.com/chart/interactive/docs/points https://i.stack.imgur.com/blkeK.png

As much as I add css and define the column type, it doesn't work.

Below is my code, but this is the test link in jsfiddle: https://jsfiddle.net/wd4egpo1/

<html>
  <head>
    <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
    <script type="text/javascript">
      google.charts.load('current', {'packages':['corechart']});
      google.charts.setOnLoadCallback(drawChart);

  function drawChart() {
    var data = google.visualization.arrayToDataTable([
    ['x', 'n1', 'n2', 'n3', 'n4', {label:'point', role:'style', type:'string'}],
      ['Mon', 20, 28, 38, 45, undefined],
      ['Tue', 31, 38, 55, 66, undefined],
      ['Wed', 50, 55, 77, 80, undefined],
      ['Thu', 77, 77, 66, 50, 'point { size: 18; shape-type: star; fill-color: #a52714; }'],
      ['Fri', 68, 66, 22, 15, undefined]
      // Treat first row as data as well.
    ], false);

    var options = {
      legend:'none'
    };

    var chart = new google.visualization.CandlestickChart(document.getElementById('chart_div'));

    chart.draw(data, options);
  }
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>
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