After you create the interface, it should be visible in LuCI under Network->Interfaces.
How do I create the interface? I don't see any new interface type, only the usual ones (DHCP/static/PPP/unmanaged/Wireguard).
Have you restarted the router since you've installed luci-proto-nebula?
PS. Looking at the other threads, a service network restart may be sufficient for system to pick up the new protocol.
Thanks, a reboot did it. I had tried restarting uhttpd but that wasn't enough.
Is there a recommended way to restart Nebula after changing the config? The restart button in LuCI doesn't seem to do anything, but I also need a way from the command line. Just killall -HUP nebula?
If using nebula-proto, same way as any other interface should work. I was planning to improve netifd support but didn't have the time/knowledge to do it before I stopped using nebula.
I think the other way is with ubus. However since restarting nebula from LuCI doesn't work I guess it won't work from ubus either. However I'm looking for a graceful reload rather than a restart so the killall -HUP is better anyway.
Thanks for your help!
I found that when using the protocol integration, the device was never actually added to the configured firewall rules - as viewed with nft list table inet v4 - even though the interface was in the firewall zone.
Instead I used an unmanaged interface containing the nebula device, with nebula-service, and the rules are added OK. This is how I run my former TINC network interface too as TINC has no protocol integration.
Probably due to:
As in, the netifd support is incomplete.
I'm glad the service option is working for you. If you're interested in continuing using nebula on OpenWrt, do consider becoming the maintainer.
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I have recently found Nebula and well, that's a bit of letdown 
I found some issue working with firewall zones using the proto package, so instead I am using the nebula-service.
I create an interface with static ip, is assigned to the device created by nebula and the static ip is inserted manually.
I have no issues for now, I guess if I need new versions I would just get the precompiled binary for my arch.
You're welcome to take over maintainership of the package so it doesn't get deleted.
It's not just me who quite maintaining OpenWrt packages over toxicity tho.