You’re on your own. Kubernetes is not supported here.
This isn’t a discourse problem, it’s a Kubernetes/ingress problem. So you should ask somewhere that there are experts in k8s and ingress.
To get help, you’d need to say where you’re running k8s (or ask somewhere specific to your platform), as the way to enable https ingres is different for different platforms (GKE, whateveramazoncallsit, bare metal and so on).