helm chart: Include multiple lines from values.yaml into configmap - kubernetes

Question

I want to create a helm chart that results in a config map that looks like this:
apiVersion: v1
kind: ConfigMap
metadata:
name: myconfigmap
data:
myconfigfile1.properties: |
property11 = value11
property12 = value12
myconfigfile1.properties: |
property21 = value21
property22 = value22
whereas this part shall be configurable in the values.yaml:
myconfig:
myconfigfile1.properties: |
property11 = value11
property12 = value12
myconfigfile1.properties: |
property21 = value21
property22 = value22
Now I want to iterate over all the children of myconfig in the values.yaml and add them to my helm template. My attempts so far with this template:
apiVersion: v1
kind: ConfigMap
metadata:
name: myconfigmap
data:
# {{- range $key, $val := .Values.myconfig}}
# {{ $key }}: |
# {{ $val }}
# {{- end }}
resulted in this error message:
$ helm install --dry-run --debug ./mychart/ --generate-name
install.go:159: [debug] Original chart version: ""
install.go:176: [debug] CHART PATH: /home/my/helmcharts/mychart
Error: YAML parse error on mychart/templates/myconfig.yaml: error converting YAML to JSON: yaml: line 11: could not find expected ':'
helm.go:84: [debug] error converting YAML to JSON: yaml: line 11: could not find expected ':'
YAML parse error on mychart/templates/myconfig.yaml
I can avoid the error by removing the | after myconfigfile1.properties: in my values.yaml, however then I lose the line breaks and the result is not what I want.
Many thanks for your help in advance.
Kind regards,
Martin

Answer 1

A few minutes after writing this question I stubled upon Question #62432632 convert-a-yaml-to-string-in-helm which does not exactly answer my question but with its help I could find the correct syntax.
values.yaml:
myconfig:
myconfigfile1.properties: |-
property11 = value11
property12 = value12
myconfigfile2.properties: |-
property21 = value21
property22 = value22
template:
apiVersion: v1
kind: ConfigMap
metadata:
name: myconfigmap
data:
{{- range $name, $config := .Values.myconfig }}
{{ $name }}: |-
{{ tpl $config $ | indent 4 }}
{{- end }}