Are you saying about fetching the data from a spreadsheet, then parsing it and export the chart with additional information? Or you have normal data, but you want to export it to excel (.XLS)? Could you provide more info to make everything clear or (as always, this would be the best) create an online jsFiddle demo? It would solve all my doubts.
my chart is embedded in a widget container with a toolbar. Export is enabled and allows to export the chart data into an excel spreadsheet. Now I would like to add additional data to this exported spreadsheet (e.g. indicating some toolbar settings and so on).
To do this, I need to hook into the process of your excel export. How to do this?
The method responsible for preparing data to export is Highcharts.Chart.prototype.getTable
Here is this method wrapped and ready for editing: https://jsfiddle.net/BlackLabel/9meL5tcs