Currently (v6.1.0) Highcharts options doesn't allow to capture drill to node event in treemap and sunburst.

I would be useful to add drillDownToNode and drillUpToNode events that will work analogically to drilldown and drillup events.

Here's a link to the topic that highlighted this problem: https://stackoverflow.com/questions/50279912/dynamically-changing-subtitles-at-various-drilldowns-in-treemap-in-highcharts