label : String

Sets the label for crosshair. These are shown on top of Axis Labels.

Default: “” (empty string)
Example: “Label”, “1940”, etc. 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
axisX:{
    crosshair:{
        enabled: true,
        label: "Custom Label",
	.
	.
    }
},
 .
 . 
});
chart.render();
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