The JVMs are really not acting as RRs. They are collecting topology information from the network to provide NorthStar the information needed to do calculations for LSPs. The BGP-LS peers in the network send the topology information to the JVMs, the JVMs pass that information to the TOPOSERVER via NTAD.
Could they be configured as RRs? Maybe! but I would not do that. That's not their purpose.
JVMs do not come preconfigured for BGP-LS or any other BGP peering. You need to configure BGP-LS.
NTAD comes up when you configure
set protocols topology-export.