Does anyone know how to add export module in HeatMap component ?

Following previous advice (thanks @AC) I tried to first load exporting.js module and then update the chart to enable export menu after the page loads, but it fails. I don't know the name of the chart object ; it should be something like Highcharts.charts[0]. 

I also saw that HeatMap component is runing Highcharts JS v4.2.6 (2016-08-02) on PP2017R2. Is there any upgrade available ? latest release is v8.1

Thanks for your help