indexLabelFontColor: String

Sets the Index Label’s Font color. The value of IndexLabelFontColor can be a “HTML Color Name” or “hex” code .

Default: “grey”
Example: “red”, “#FAC003” .. 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 data: [{
  dataPoints: [
   { x: 10, y: 10,  indexLabel: "label1", indexLabelFontColor: "green" },

   ],
  },

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