ExternalIP

oc edit Network.config.openshift.io cluster

---
# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: config.openshift.io/v1
kind: Network
metadata:
  creationTimestamp: "2021-02-12T11:31:50Z"
  generation: 3
  name: cluster
  resourceVersion: "1444520"
  selfLink: /apis/config.openshift.io/v1/networks/cluster
  uid: 7103512a-6b57-4ef5-8d8a-41bf119809ea
spec:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  externalIP:
    autoAssignCIDRs:
    - 192.168.131.192/26
    policy:
      allowedCIDRs:
      - 192.168.131.128/26
  networkType: OVNKubernetes
  serviceNetwork:
  - 172.30.0.0/16
status:
  clusterNetwork:
  - cidr: 10.128.0.0/14
    hostPrefix: 23
  clusterNetworkMTU: 1400
  networkType: OVNKubernetes
  serviceNetwork:
  - 172.30.0.0/16

---
oc patch svc golang  -p '{"spec":{"externalIPs":["192.168.131.129"]}}'

---
oc get service
NAME            TYPE        CLUSTER-IP       EXTERNAL-IP       PORT(S)    AGE
golang          ClusterIP   172.30.99.140    192.168.131.129   8080/TCP   2d7h
nginx-example   ClusterIP   172.30.158.210   <none>            8080/TCP   2d8h
---

Must configure your networking infrastructure to ensure that the external IP address blocks that you define are routed to the cluster and check that firewall should not block that traffic.

To test: 

192.168.50.13 is one of the Worker Nodes ( In case of IPI, use the ingress VIP )

---
ip route add 192.168.131.128/26 via 192.168.50.13
---

[user@cloud ~]$ curl 192.168.131.129:8080
Hello OpenShift!

:D