Include hidden series in exported CSV using Highcharts v8.0 - highcharts

Question

I have a working Highcharts bar chart with 2 series that exports to CSV correctly. I added a hidden ROUND series that should be included in the exported CSV data. Setting the includeInDataExport property to true is supposed make this happen. However, this is not working for me and I've not found an example showing how to correctly use this property.
Here are the current chart options.
{
chart: {
type: "bar"
marginTop: 30
spacingRight: 50
style: {
fontWeight: "400",
fontFamily: "Montserrat"
}
},
title: {
text: ""
}
xAxis: {
categories: Array(7),
lineWidth: 1
}
yAxis: {
min: 0,
lineWidth: 1
}
legend: {
reversed: true,
itemStyle: {
}
}
tooltip: {
headerFormat: "COMPANY: {point.x}<br/>",
pointFormat: "{series.name}: <b>${point.y}</b>"
}
plotOptions: {
bar: {
dataLabels: {
enabled: true
},
includeInDataExport: true
},
series: {
colorByPoint: true,
includeInDataExport: true
}
}
series: [
{
name: "ROUND",
data: [
0,
0,
0,
0,
0,
0,
0
],
visible: false,
showInLegend: false
},
{
name: "P2",
data: [
230.3,
228.25,
217.72,
243.34,
235.56,
205.73,
252.83
]
},
{
name: "P1",
data: [
115.15,
115.58,
104.2,
115.58,
113.34,
101.27,
121.3
]
}
]
}}

Answer 1

It seems that the current Highcharts logic doesn't allow to get CSV data from series which has visible set to false, see: https://github.com/highcharts/highcharts/blob/master/js/modules/export-data.src.js#L350
From this code, it seems like in the past someone has a purpose in it because of some bug, but I am not sure what to think about it now. If you want you can start a thread in the Highcharts Github issue channel: https://github.com/highcharts/highcharts/issues
As a workaround I suggest to use this logic just without this condition about series visibility:
Demo: https://jsfiddle.net/BlackLabel/n5za1q3x/
this.series.forEach(function(series) {
var keys = series.options.keys,
pointArrayMap = keys || series.pointArrayMap || ['y'],
valueCount = pointArrayMap.length,
xTaken = !series.requireSorting && {},
xAxisIndex = xAxes.indexOf(series.xAxis),
categoryAndDatetimeMap = getCategoryAndDateTimeMap(series, pointArrayMap),
mockSeries, j;
if (series.options.includeInDataExport !== false &&
!series.options.isInternal // #55
) {
.........