verticalArrow property
A vertical arrow annotation bindings. Includes start
event. On click,
finds the closest point and marks it with an arrow.
#06b535
is the color of the arrow when
pointing from above and #f21313
when pointing from below the point.
API Docs: https://api.highcharts.com/highstock/navigation.bindings.verticalArrow
Implementation
Map<String, dynamic>? verticalArrow;