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Is this the way? `cat coredns-custom.yaml`:

apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns-custom
  namespace: kube-system
data:
  my.internal.subdomain.net.server: | # All custom server files must have a ".server" file extension.
    # domain you wish to forward
    my.internal.subdomain.net {
      # customer DNS resolver
      forward . w.x.y.z
    }

kubectl apply -f coredns-custom.yaml

kubectl -n kube-system rollout restart deployment coredns