this is available today. Custom Dashboards support 13 call widgets you can add directly: Incoming/Outgoing Calls by Status, Total Call Duration (in/out), and Avg. Call Duration (in/out). You can filter by Call Status, Direction, Assigned To, Call Attended By, and Source Type.

See the release here: https://ideas.gohighlevel.com/changelog/introducing-call-widgets

And how to add widgets to your dashboard: https://help.gohighlevel.com/support/solutions/articles/155000001212-what-are-dashboard-widgets-