labelFontWeight: String

Set the font Weight used in Axis Labels. It can be set to one of the options below.

Default: “normal”
Options: “lighter”, “normal”, “bold” , “bolder” 
var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisY:{
   labelFontWeight: "bold",
 },
 .
 .
});
chart.render();
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