Hello,
You can use "instance-import" with "from instance master" match condition if target routing instance is "instance-type virtual-router" or "instance-type forwarding".
If target routing instance is VRF, the only way to import routes from inet.0 to VRF avoiding rib-groups is to use lt-* interface pair or physical cable loop and setup Your favourite routing protocol across this lt-* pair/cable loop to exchange routes between inet.0 and VRF.
HTH
Thanks
Alex