indexLabelFontStyle: String

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

Default: “normal”
Options: “italic”, “oblique”, “normal” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 data: [{
  dataPoints: [
   { x: 10, y: 10,  indexLabel: "label1", indexLabelFontStyle: "italic"},

   ],
  },

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