external-secrets/docs/snippets/merge-template-v2-external-secret.yaml

{% raw %}
apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: template
spec:
  # ...
  target:
    template:
      mergePolicy: Merge
      engineVersion: v2
      data:
        name: admin
        password: "{{ .password | b64dec }}" # Overwrites the password from the data call and use this output
  data:
  - secretKey: password
    remoteRef:
      key: /credentials/password
  - secretKey: username # Preserves the username in the templated Secret
    remoteRef:
      key: /credentials/username
{% endraw %}