RCU config: Forms 12c Repository to Data Guard Primary Service Name.

We are new to Forms 12c and going through the installation.  We are at the point to create the Forms 12c repository.  I want to point it to a Data Guard primary service name so Forms will follow that service name in event of a switchover to standby.  In my case I have two scan hostnames I would need to enter but don't see an option do so.  In my case, for example, I have cluster hq-scan.domain where primary service resides and dc-scan.domain where standby DBs reside.  I have a Data Guard primary service name of ProdDBprim for a database