Advices for Firewalla Blue+ and OpenWrt for 5G

Goodmorning, for my countryside home I just bought a 5G CPE (Zyxel nr7101). I’ve already have a Firewalla Blue+ (love it!) and an apu2c4 with OpenWrt installed. I would like to configure 5G CPT in IP pass trough to OpenWrt wan, and route the incoming connection to lan side managed by OpenWrt. My idea is to manage everything in lan side (dhcp, dns, ad block…) with Firewalla but not sure in which way… Do you have any suggestion? Thank you so much, everything’s appreciated!