Adding Drill-Down support
Custom visuals are capable of using PowerBI’s drill down.
Read more about Power BI drill down here
How to add drill down support to your custom visual
To support drill down in your visual, add a new field to “capabilities.json” named
drilldown which has one property:
roles - the name of the dataRole you want to enable drill down on.
The drill down dataRole must be of ‘Grouping’ type.
“max” property in the dataRole conditions must be set to 1.
Once you add the role to
drilldown, users can drag multiple fields into the data role.