I'm trying to setup an ingress controller(nginx) to forward some TCP traffic to a kubernetes service(GCP). There's this tutorial that shows how to route HTTP traffic to services (based on the paths) using nginx. I want to have a similar setup to forward TCP traffic.

In my cluster, I have a pod running a TCP echo server written in python using sockets. There is a service attached to the pod. If I set the service type of this service to LoadBalancer, I can run my client as follows and get the echo from the cluster.

python client.py --host <EXTERNAL-IP-OF-LOAD-BALANCER> --port <PORT>

Similar to the echo server, I have other TCP services in my cluster that serves other pods. Currently I have set all of them to LoadBalancers. So, they have external IPs and listen for traffic on different ports. However, I do not want to create LoadBalancers to all of these services. How would I use the nginx to route the TCP traffic to different services based on the port numbers. If nginx cannot do this, are there other options that I can use to achieve this?

UPDATE: Following the HangDu's answer I created the following files.

apiVersion: v1
kind: ConfigMap
metadata:
  name: tcp-services
  namespace: default
data:
  9000: "default/echo-service:50000"

and

apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: default
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: LoadBalancer
  ports:
    - name: http
      port: 80
      targetPort: 80
      protocol: TCP
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
    - name: proxied-tcp-9000
      port: 9000
      targetPort: 9000
      protocol: TCP
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

Then I used kubectl create -f <FILE_NAME> to create the config map and the service. So I was hoping I could use the external IP of the newly created service and the port 9000 and run python client.py --host <EXTERNAL-IP-OF-LOAD-BALANCER> --port 9000 to run my echo client. However, I get a connection refused error when I do that. Am I doing something wrong?