How can I give our Data Center JSM customers view-only access to restricted pages in Confluence?

[Ada Kardos]

I've found a few articles referencing how internal Cloud JSM customers can view Confluence content directly in Confluence, but we are a Data Center customer and I haven't been able to find documentation supporting DC.

Our customers can view knowledge base content from the portal, but I am unclear on how to apply their customer account credentials to Confluence so they can log in and view certain restricted (not anonymous) pages directly in Confluence? 

Is this a cloud-only feature?