How do I set custom headers using Google Kubernetes Engine?

I understand that an NGINX Ingress controller allows custom header creation using a ConfigMap. Is there either:

1. a way to use NGINX for GKE or
2. to directly specify custom headers in the networking.gke.io namespace?

I am specifically interested in setting HTTPS Strict Transport Security, Upgrade Insecure Requests and Content Security Policy headers. I find it a little award that the redirectToHttpfeature does not enabled these by default so I am desperate for any ideas.

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