How to install two ingress-nginx-controller & ingress-nginx-extra-controller

Hi Team, I am trying to install two ingress-nginx and getting the following error -

Command used -
helm install ingress-nginx nginx-stable/nginx-ingress -n ingress-nginx
Output - Successfully deployed

helm install ingress-nginx-extra-controller nginx-stable/nginx-ingress -n ingress-nginx
Error-
Error: INSTALLATION FAILED: rendered manifests contain a resource that already exists. Unable to continue with install: IngressClass "nginx" in namespace "" exists and cannot be imported into the current release: invalid ownership metadata; annotation validation error: key "meta.helm.sh/release-name" must equal "ingress-nginx-extra-controller": current value is "ingress-nginx"

I could not find any documentation on above in this repo - can you please suggest