Setting this property to true makes dataPoints to appear in legend.
Default: falsevar  chart =  new  CanvasJS.Chart("container",
{
 .
 .
	data: [
	{
		type: "pie",
		dataPoints: [
			{ y : 10, showInLegend: true},
		]
	}
	]
 .
 . 
});
chart.render();
Also See: