Helm Chart - How to set configMap from values.yaml?

I have a file application.yaml from my spring configuration. I want to reuse this file in ConfigMap. I defined these properties in Helm's values.yaml and then reading them in configmap.yaml.

Here are all the files:

application.yaml

invoice:
  catalog-service-uri: http://catalog-service
spring:
  flyway:
    url: jdbc:postgresql://invoice-postgres/invoice_order
  r2dbc:
    url: r2dbc:postgresql://invoice-postgres/invoice_order
  rabbitmq:
    host: invoice-rabbitmq
  security:
    oauth2:
      resourceserver:
        jwt:
          issuer-uri: http://ecomm-keycloak/realms/EcommRealm

values.yaml

configMapData:
  application.yaml: |-
    invoice:
      catalog-service-uri: http://catalog-service
    spring:
      flyway:
        url: jdbc:postgresql://invoice-postgres/invoice_order
      r2dbc:
        url: r2dbc:postgresql://invoice-postgres/invoice_order
      rabbitmq:
        host: invoice-rabbitmq
      security:
        oauth2:
          resourceserver:
            jwt:
              issuer-uri: http://ecomm-keycloak/realms/EcommRealm

configmap.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: order-config
  labels:
    app: order-service
data:
  {{- range $key, $value := .Values.configMapData }}
    {{ $key }}: |-
      {{ $value | indent 4 }}
  {{- end }}

With this configuration, I am getting error:

msg: 'error unmarshalling resource: error converting YAML to JSON: yaml: line 7:
did not find expected node content'

What's wrong with this configuration?
Is there any better way of doing the same?

Any help would be highly appreciated.

Thanks

Try this:

apiVersion: v1
kind: ConfigMap
metadata:
  name: order-config
  labels:
    app: order-service
data:
  {{- .Values.configMapData | toYaml | nindent 2 }}

The answer by Andromeda works fine. An alternate, if you want to use the application.yaml file directly.

Place the file in your helm-chart/ directory (not inside templates).

configmap.yaml:

kind: ConfigMap
apiVersion: v1
metadata:
  name: order-config
  labels:
    app: order-service
data:
  application.yaml: |-
{{ .Files.Get "application.yaml" | indent 4 }}

This shall produce the same result. Hope this helps!