Setting custom Request Headers through nginx ingress controller

Question

I have a kubernetes cluster using nginx controller to proxy requests to the backend. There is an LB in the front.

LB <-> Nginx Ingress <-> WLS in K8s

When I terminate the SSL at the LB, and the backend sends a redirect it will send the redirect with location that starts with http. However, WebLogic recognizes WL-PROXY-SSL request header to send a https redirect.

I am trying to set the request header on the Nginx Ingress controller for a specific URL patterns only.

Tried using

nginx.ingress.kubernetes.io/configuration-snippet: |
      proxy_set_header WL-PROXY-SSL: "true";

It didn't work.

Even tried ....

more_set_headers "WL-PROXY-SSL: true";
    nginx.org/location-snippets: |
      proxy_set_header "WL-PROXY-SSL: true";

Also tried the custom-headers module but it sets for all resources. While I see the entry in the nginx.conf, it is not taking effect even with global custom-headers configMap also.

Is there any good example of adding this header to the request ?

Thanks in advance.