Allow pages on non-primary Confluence instances to be linked to Sprints

When linking a Confluence page (outlined here), I am only able to search and link to the Confluence instance marked as the "primary" in the application links.  I would like to be able to choose which Confluence instance JIRA is searching in so that I could link to pages stored in non-primary Confluence instances.

Our large company runs multiple Confluence instances that are all connected to our JIRA instance.  The Confluence instance my team works out of is not the one designated as primary in the app link.  This means that I am unable to link pages to a Sprint or a Sprint Report.