@kpandey017,
It is not possible to show dataPoint with 0 value on pie chart as of now. However, indexLabel for dataPoints with 0 value is displayed. In your case, you can pass dataPoints with negligible values along with 0 value dataPoint and indexLabel.
Please take a look at this JSFiddle for an example.
___________
Indranil Deo
Team CanvasJS