Hi,
what you are looking for is "multiple address families in OSPFv3" which looks like it's only supported on high-end platforms (https://pathfinder.juniper.net/feature-explorer/feature-info.html?fKey=3012&fn=Support+for+multiple+address+families+in+OSPFv3 )
But: I have tried to input the commands on a SRX300 running 15.1X49-D75 and at least the commit check does not give any warnings... so I would give it a try on your lab enviroment :-)
Example configuration guide can be found here: http://www.juniper.net/techpubs/en_US/junos13.2/topics/topic-map/ospfv3-multiple-address-families.html
Let us know if you get it working :-)