I'd like to investigate an issue with nginx-ingress on a GKE cluster. Therefore I need to enable admission controller and was wondering whether this is possible on GKE. I'm creating the cluster with

[authentication boilerplate]
gcloud container clusters create cluster-name --machine-type=n1-standard-1 --no-enable-stackdriver-kubernetes --no-enable-autoupgrade --preemptible

I find no option in gcloud --help or gcloud container clusters create --help.

I need to enable the admission controller for service accounts.