indexLabelFontWeight: Number

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: [{
  indexLabelFontWeight: "bold",

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