Aggregation Link on Transparent firewall Fortigate 1500D

Hello All,

Wondering if attached design could work with Fortigate-1500D in transparent mode?

From the design I would like to force traffic to pass through the firewall's Agg_link on a VLAN (eg: VLAN1), and get mapped back to the paired VLAN (eg: VLAN2), that when the traffic trying to communicate with the other subnets.

if the design is not possible, please help to correct it :)

regards