JunOS route multiple subnets on single ge

I want to route three things across one ge-0/0/x port to public internet on an SRX-345: 1. a management vlan-tagged traffic 172.16.10.0/24 on unit 0 NAT'ed to mgmt port/subnet, regular traffic 192.168.100.0/24 on unit 1 NAT'ed, and transparently route a public static 1.2.3.5/27 on unit 2. I have attached a network diagram (though it doesn't show the management vlan. I can use multiple ports if necessary, but would prefer one. I have all the NAT'ing done and traffic is flowing fine, I just don't know how to add the public static transparent route.