'How i can read a yaml dict and use it inside helm-template

I am creating a helm libary that i will use in other helm chart and i want to have a common values file in this libary. I have thought to do it using a external file and load it like below but i haven't be able to do it. What i am doing wrong? Thanks

##defaultRoutesHelm.yaml
route:
  dev:
    path: dev.es
    labels:
     router: alpha
  staging:
    path: staging.es
    labels:
     router: beta
--
{{- $helmRoute := .Files.Get "config/defaultRoutesHelm.yaml" | fromYaml }}
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Release.Name }}-configmap
data:
  path: {{get $helmRoute 'route.dev.path'}}


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