Try to append to a ConfigMap a new server inside the http context using the http-snippet.

For example:

...
data:
  ssl-redirect: "false"
  hsts: "true"
  server-tokens: "false"
  http-snippet: |
    server {
      listen 8000 proxy_protocol;
      server_tokens off;
      return 301 https://$host$request_uri;
    }

This will prevent overriding the original nginx.tmpl, ensuring more compatibility in case of upgrade the Nginx Ingress version.

Please take a look: ingress-too-many-redirects, too-many-redirects-with-reverse-proxy.

Useful article: too-many-redirects-wp