In V5, how to apply styles to tooltips crosshairs

[clmz]

How can I apply styles (here: change the stroke color) to the tooltips crosshairs?
The doc says:

Can someone please give an example to this?

[hustcc]

Here is an issue.

[clmz]

@hustcc
Thank you, but - with all due respect - how the hell shall someone figure out how this works without any documentation?

[pearmini]

Here is the docs: https://g2.antv.antgroup.com/spec/interaction/tooltip