itemDelimiter property
The item delimiter in the exported data. Use ; for direct
exporting to Excel. Defaults to a best guess based on the browser
locale. If the locale decimal point is ,, the itemDelimiter
defaults to ;, otherwise the itemDelimiter defaults to ,.
API Docs: https://api.highcharts.com/highcharts/exporting.csv.itemDelimiter
Implementation
String? itemDelimiter;