[Solved]-Highcharts: Trigger showing tooltip programatically with selenium-Highcharts

You should be able to get global Highcharts variable and call onMouseOver method on a specific point.

Highcharts.charts[0].series[0].points[0].onMouseOver();

You can also dispatch mousemove event directly on a svg element.

document.getElementsByClassName('highcharts-point')[0].dispatchEvent(new Event('mousemove', { 'bubbles': true }));

API Reference: https://api.highcharts.com/class-reference/Highcharts.Point#onMouseOver