Is it possible to filter Conversation Detail by internal skill assignments?

Is it possible to filter the Conversation Detail view by specific internal skill assignments within the EU-West environment? The standard filters only expose customer-facing skills, which prevents isolating post-call wrap-up times for internal review tasks.

Current filter payload:

{
 "type": "skill",
 "value": "internal_audit_01"
}

The system returns an empty dataset despite confirmed skill assignments in the Agent profile.