I know OP was asking for Nginx but maybe someone is stumbling across this. Traefik has native support for Consul and Nomad Service Discovery.

I was also using Nginx at the beginning but then switched to Traefik because of its native integration.

https://doc.traefik.io/traefik/providers/consul-catalog/

https://doc.traefik.io/traefik/providers/nomad/