legendMarkerType: String

Sets the Legend Marker to one of the options below. At dataPoint level, this property works only with Pie and Doughnut charts.

Default: “circle”
Options: “circle”, “square”, “cross”, “triangle” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
  data:[ {
   dataPoints: [
    {x: 10 , y: 50 , legendText: "Apple", legendMarkerType: "square" },

  ],

  },
 ]
 .
 .
});
chart.render();
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