[update]
We have just released v1.9.6 Beta with Methods & Properties, which allows you to programmatically export chart as image, print chart, access internally calculated values, etc. Please refer to the release blog for more information.
Rahul,
As of now we don’t have a way to do this via CanvasJS API. But given that you have all the dataPoint, you can do it programmatically by searching through the array.
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Sunil Urs