As Wojtek indicates this has not been supported until recently. Your SRX cluster needs to be running at least Junos 18.1R1 to support this functionality:
VRRP and VRRPv3 support on redundant Ethernet interface to provide redundancy (SRX Series, vSRX)—Starting with Junos OS Release 18.1R1, SRX Series devices in a chassis cluster support the Virtual Router Redundancy Protocol (VRRP) and VRRPv3 on reth interfaces to provide redundancy, route advertising, and load sharing. Using VRRP, a secondary node can take over a failed primary node within a few seconds with minimum VRRP traffic and without any interaction with the hosts.