USG 3 WAN trunk VLANs forwarded to LAN

Is there a way to configure the usg to pass the normal internet vlan of 1 and the IPTV vlan 3999 through WAN to LAN of the USG and then to a SWITCH which has the ability to edit vlan traffic?

I have never done it,but someone has a config here that might help.
https://community.ubnt.com/t5/UniFi-Routing-Switching/2-VLANs-on-WAN-Internet-and-IPTV-USG-PRO/td-p/2079958

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