How to add percentage value inside slice of pie chart and on the top of bars in bar chart?

[daad.madhusudan]

I am new to jasper repoting and I am creating some sample reports. Here I am sharing the reports that I created using ireport designer.

               

I want the percentage values on the top of individual bar in the bar chart and inside individual slice in pie chart.  I couldn't achieve this using ireport designer. I read about using customizers but I couldn't get proper material. Can someone please help me to achieve this? 

 

[james.t]

For the pie-chart I added this property via the Show Advanceed Properties button. Note I had a variable which contained the total count which I used to calculat the percentage:

plotOptions.pie.dataLabels.formatter

Tick Use an expression

"function() { return ((this.y / " + $V{V_TOTAL_COUNT}.doubleValue() + ") * 100).toFixed(2) + '%';}"