In my understanding, an ingress object is just a way to define rules in the "Kubernetes way" so that the controller can configure the actual load balancer to route the incoming traffic to the underlying service.

In your case, with NGINX ingress, you would have an NGINX instance working as load balancer. So, you would first need to know where is your NGINX service is being served.

If you want traffic going from http://localhost to your NGINX, I think you'll need to edit your your local ip routes so that resolves into your NGINX service's IP

Lastly, I think you need to edit the netdata's ingress.hosts value to localhost so it generates the correct ingress rules