Not able to add custom data along with csv while downloading using export-csv.js (highcharts)

[ranjithrb]

Hi,
I have implemented the csv download by adding an export-csv.js file to ng2-highcharts.

App Module

const hc = require('highcharts');
const exp = require('highcharts/modules/exporting');
const csv = require('highcharts-export-csv/export-csv');

exp(hc);
csv(hc); 

On adding these, "Download CSV" option came.

The problem here is I'm not able to add custom data to my exported CSV.
How can I add custom data ?