Hello there,
Thanks for contacting us again!
You can simply achieve that by using a tooltip with
tooltip.followPointer property. To adjust the tooltip's styles and content, you should use the
tooltip.pointFormat property optionally combined with
tooltip.useHTML property to render the HTML tags instead of SVGs. Alternatively, you can use the
tooltip.pointFormatter property depending on your needs.
Take a look at the demo for better visualization:
https://jsfiddle.net/BlackLabel/f5ys8wmk/
Let me know if that was what you were looking for,
Kind Regards!