DHCP Option 82 insert on SRX300 in switching mode?

Hello,

Looking at using an SRX to insert DHCP option 82 in switching mode on some ports. I've looked through juniper documentation and the non-els options don't seem to exist. I've tried configuring under forwarding options (global) and under the vlan but don't result in no DHCP option82 insertion. 

I don't see any dhcp-security options under the vlan interface menu nor the switching-options menu.

Is this simply not supported by SRX300 series? The use case is for small micropop sites needing a juniper switch that's DC powerable and compact. The EX2300c is AC only so hoping to use an SRX300 with a DC>DC 12v adapter.

Thanks,

Tim

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/example-setting-up-dhcp-option82-no-relay.html

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/dhcp-relay-agent-information-option82.html#id-using-dhcp-relay-agent-option-82-information