Routing on layer 3 Fortiswitch

Hi all.

I have installed a Fortiswitch over layer 3 network, my fortiswitch is already managed by a remote Fortgate. Fortiswitch is connected directly with a 3rd party firewall in a branch site.

Config looks like this:

config system global
set switch-mgmt-mode fortilink
config switch interface

edit "internal"
set native-vlan 4094
set stp-state disabled
set snmp-index 11
next
edit "__FoRtILnk0L3__"
set native-vlan 4094
set allowed-vlans 1-4094
set dhcp-snooping trusted
set igmp-snooping-flood-reports enable
set mcast-snooping-flood-traffic enable
set snmp-index 13
next

config system interface
edit "internal"
set ip 172.29.xx.xx 255.255.255.0
set allowaccess ping https ssh
set type physical
set snmp-index 12
next

config switch-controller global
set ac-discovery-type static
config ac-list
edit 1
set ipv4-address 172.29.8.1
next
end
end
config system ntp
set allow-unsync-source enable
config ntpserver
edit 1
set server "172.29.8.1"
next
end
set ntpsync enable
end
config router static
edit 1
set dst 0.0.0.0 0.0.0.0
set gateway 172.29.254.1
next
end

The Fortiswitch is connected to an access port on the firewall (port without any vlan tagging), in a tagged port of the firewall Fortilink did not came up due to problems with native vlan.

How do I route local VLANs in the branch? Do I have to connect another physical port Fortiswith <--> Firewall configured as trunk with all the vlans? How can I do it with only one physical port?

I can not find any example on the Fortinet community.

Thanks.