Cellular IP Passthrough from Zyxel Router to Netgear R8000

hi everyone, ive come here because im basically stuck on everything to do with my router and my modem. i have a zyxel NR5103EV2 5g hub/modem and i am trying to enable cellular IP passthrough (bridge mode) to go to my netgear r8000 router. I want my netgear router to handle all NAT related operations and want it to basically do everything. i only want my 5g hub (zyxel modem) to act as a way of 'giving internet' to my netgear router. I am trying to port forward on the netgear router, and I am having NO luck, and I am in desperate need of assistance. If anyone could help I would really appreciate it 🙂