indexLabelFontWeight: String

Sets the Index Label’s Font Weight. It can be set to one of the below options.

Default: “normal”
Example: “lighter”, “normal”, “bold”, “bolder” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 data: [{
  dataPoints: [
   { x: 10, y: 10,  indexLabel: "label1", indexLabelFontWeight: "bold" },

   ],
  },

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