highchart js API has click event as described in docs here https://api.highcharts.com/highcharts/plotOptions.series.events.click

If I extend charts by providing JSON with additional series and click event, then it does not fire. 

Outsystems's chart control event OnClick works. But with extended JSON I provide external series to a chart, and OnClick event does not fire on different series. That is why I use API click event in JSON, but it is not fired as well. But it works in jsfiddle.