Timeline with tooltips. Is it possible?

Hi guys,
How to use tooltips in timelines? If I needed to use tooltips inside ‘normal’ charts I would know what to do, but inside timelines I can’t get

configuration .getTooltip() .setFormatter( "''+ this.series.name +' '+this.x +': '+ this.y +'°C'"); Any help is highly appreciated, even if it is not possible, please let me know.