addSeries property
Fires when a series is added to the chart after load time, using the
addSeries method. One parameter, event, is passed to the
function, containing common event information. Through
event.options you can access the series options that were passed to
the addSeries method. Returning false prevents the series from
being added.
API Docs: https://api.highcharts.com/highcharts/chart.events.addSeries
Implementation
HighchartsCallback? addSeries;