Part of the problem is that the “report” is just a dump of the raw CDR database.
Once upon a time (a long time ago) the CDR worked on calls and their disposition. This, unfortunately, didn’t provide enough detail about who didn’t answer calls in ring groups or queues. Around Asterisk 1.8, the CDR database was changed to include all of the calls processed by the system.
It might help to remember that there’s no scenario where an incoming call that is delivered to an extension is “one call”. The incoming call is one call, the outbound call to the extensions are more calls, and they are all bridged together when one of the picks up the phone.
The database reports all of the data you need to make a report that tells exactly what you need. There is also (IIRC) a commercial report package that can give you the level of insight you are looking for.