custom tag on EBS volume provisioned dynamically by Kubernetes
Seems like at this point in time is not something possible yet.
Found these:
https://github.com/kubernetes/kubernetes/pull/49390
https://github.com/kubernetes/kubernetes/issues/50898
Hopefully something will be done soon.
The current approach is to use the AWS EBS CSI Driver instead of the K8s intree provisioner: https://docs.aws.amazon.com/eks/latest/userguide/ebs-csi.html
If you use this new provisioner, you can add new tags using this: https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/e175fe64989019e2d8f77f5a5399bad1dfd64e6b/charts/aws-ebs-csi-driver/values.yaml