'How to customize csv data in amcharts3 export function in Angular

I have 2 columns 1 with id and the other with a count. Now I want to add a column to display the percentage in the CSV and a heading for the file.

data: [ { 
0: {id: '0', count: 80}, 
1: {id: '1', count: 100}, 
2: {id: '2', count: 20}, 
3: {id: '3', count: 40},
4: {id: '4', count: 30} 
}]

I have tried process data in the export function of Amchart3, but not working. Can anyone help me to solve this?

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