Hi,
Something like this comes out, it looks like there's no support under the date like this.
And what exactly would you like to show and how and from which side the arrow should come out?
https://jsfiddle.net/BlackLabel/p4vxchu7/
I guess a better approach would be to use Highcharts.SVGRenderer to draw arrows, something similar to this example.
https://jsfiddle.net/BlackLabel/gtzp1qu4/
https://api.highcharts.com/class-refere ... VGRenderer
Best regards.