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

{% raw %}
apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: template
spec:
  # ...
  target:
    name: secret-to-be-created
    # this is how the Kind=Secret will look like
    template:
      type: kubernetes.io/tls
      engineVersion: v2
      data:
        # multiline string
        config: |
          datasources:
          - name: Graphite
            type: graphite
            access: proxy
            url: http://localhost:8080
            password: "{{ .password }}"
            user: "{{ .user }}"          
        # using replace function to rewrite secret
        connection: '{{ .dburl | replace "postgres://" "postgresql://" }}'

  data:
  - secretKey: user
    remoteRef:
      key: /grafana/user
  - secretKey: password
    remoteRef:
      key: /grafana/password
  - secretKey: dburl
    remoteRef:
      key: /database/url
{% endraw %}