color: String

Sets the color of dataPoint. It overrides the color set at dataSeries level or the one chosen from theme. Value of color can be “HTML Color Name” or “hex” code.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
  data:[ {
   dataPoints: [
    {x: 10 , y: 50 , color: "Indigo" },

  ],

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