角度：如何使用Google图表在气泡图中添加虚线？

如何解决角度：如何使用Google图表在气泡图中添加虚线？

我想使用Google Charts用虚线显示气泡图。我用它来绘制气泡图，需要绘制虚线，而不是折线图组合。

请看这张图片：

有什么想法吗？

google.charts.load('current',{'packages':['corechart','scatter']});
google.charts.setonLoadCallback(drawVisualization1);
  function drawVisualization1(){
    var A=  ["product","A",{ role: 'annotation' },"B","C",{ role: 'annotation' }]
    var premiumEarnedRArr12=["data",20,40,70,"C"];
    var stackBarData1= google.visualization.arrayToDataTable([ 
      A,premiumEarnedRArr12
    ]);
    var options12 = 
    {
      //title : 'Monthly Coffee Production by Country',isstacked:true,pointSize: 10,chart: { title: 'subject data',},series: {   1:{  type: 'scatter',axis: 'final grade',targetAxisIndex:1,color: '#B07AA1',annotations: { stem: { length: -5 },textStyle: { color: 'black',fontSize: 10,bold:true }},}
              },vAxes: {  1:{ gridlines: {color: 'transparent'},minValue:0,title:"values",ticks:  [{v: 0,f: '0%'},{v: 10,f: '10%'},{v: 20,f: '20%'},{v: 30,f: '30%'},{v: 40,f: '40%'},{v: 50,f: '50%'},{v: 60,f: '60%'},{v: 70,f: '70%'},{v: 80,f: '80%'}],format:"#%" }},}
     var container = document.getElementById('chart_div');
    var chart = new google.visualization.ComboChart(document.getElementById('chart_div'));
    chart.draw(stackBarData1,options12);



  }