Custom go template function throwing an error

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error: template: odfNS.yaml:10:16: executing "storage/odf-external/odfNS.yaml" at <{{template "hello"}}>: template "hello" not defined

{{define "hello"}}
    hello: world
{{end}}
apiVersion: v1
kind: Namespace
metadata:
  name: openshift-storage
  annotations:
    workload.openshift.io/allowed: management
    {{ template "hello" }}
  labels:
    openshift.io/cluster-monitoring: "true"

It should render instead of the error

apiVersion: v1
kind: Namespace
metadata:
  name: openshift-storage
  annotations:
    workload.openshift.io/allowed: management
    hello: world
  labels:
    openshift.io/cluster-monitoring: "true"

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/kind bug