Openwrt TP-link 210 vlan tagging help

Hey gang, 
Despite the title this IS AREDN related. We are deploying a backbone link and 2.4ghz aredn AP on a roof top and the building management has given us permission to use the building internet (wifi). The internet part will be used for backhaul of other repeaters (allstar,wiresx,etc.) from another location. In order to make use of the building internet, I am running wireguard vpn. The cpe210 is flashed with openwrt and my vpn peer configured. Since the cpe210 only has 1 eth port, openwrt doesn't show switch settings (vlan). The configuration below is the basic setup. I know a bunch of yall are proficient in openwrt as well as aredn and was hoping I could get an answer on......How do I configure the cpe210 to tag vlan1 to its eth port so that the 2 aredn nodes see wan traffic? The nodes are getting WAN assigned ip info from the cpe210 but i dont think they know its WAN. I don't have a small managed switch to put in place of the dumb switch and i've never done VLAN before. Thanks! KG4FJC