markerMargin: Number

Sets the margin between marker and text of each item inside legend.

Default: Automatically calculated based on the chart size.
Example: 4,12 ..

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 legend:{
  .
  markerMargin: 4,
  .
 },
 .
 . 
});
chart.render();