Ingress routing rules to access opentelemetry otel collector

Question

I have setup opentelemetry otel collector on AKS cluster and used node port service to expose the endpoint running on port 5555 of the otel collector,

This setup works as expected, I am able to hit the http://{AKS_Node_IP}:30807.

Now I want to expose this url using Nginx Ingress. I did setup of nginx ingress controller using load balancer as service type and it is able to run successfully,

Now I want to ad an Ingress resource that accepts a Prefix and redicts back to the otel-collector-external service. For that I am using the following yaml,

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: obs-dev-ingress-otlp
spec:
  ingressClassName: default
  rules:
  - host: dev-obs-k8.he.net
    http:
      paths:
      - path: /otel-collector
        backend:
          service:
            name: otel-collector-external
            port:
              number: 5555
        pathType: ImplementationSpecific

NOTE - I am using 5555 port as my reciever grpc. Now If I try to hit the url http://{My_Load_Balancer_external_IP}/otel-collector. Nothing happens, the request is not reaching the mentioned service otel-collector-external due to which the request is not reaching the underlying pod.

I wanted to ask is there any different path that we need to expose otel-collector?

NOTE - I have exposed other services on the same Ingress controller and it works as expected, only otel-collector is not working.