Query group "Activity Count" via API?

Hi Community,

We'd like to be able to pull one of the metrics from the Telligent reporting section of the admin panel into a separate executive dashboard we're building.  So I looked around to see if there is an API call to pull the "Activity Count" data by group, but I couldn't find anything.  See the attached screenshot for where the metric lives in the admin panel.

Do any of you know if there's an API call to get that?  Thanks!