How to iterate files in a directory to create configmap use Asconfig function in helm

Question

I have 'n' yaml files inside test folder. I want to mount it as configMap in helm as follows. The below sample is just to show two yaml files but I need to add entry like this for all yaml files under 'test' directory.

configmap.yaml:

apiVersion: v1
kind: ConfigMap
metadata:
    name: sample-conf
data:
  sample-config.yaml: |
{{ tpl ( .Files.Get "test/sample-config.yaml" ) . | indent 4 }}
  sample1-config.yaml: |
{{ tpl ( .Files.Get "test/sample1-config.yaml" ) . | indent 4 }}

da-statefulset.yaml entry will look like:

apiVersion: v1
kind: Pod
metadata:
  name: my-lamp-site
spec:
    containers:
    - name: container-a
      image: My_image
      volumeMounts:
      - name: sample-profile
        mountPath: /root/dir1/sample-config.yaml
        subPath: sample-config.yaml
      - name: sample-profile
        mountPath: /root/dir1/sample-config.yaml
        subPath: sample-config.yaml
    volumes:
    - name: sample-profile
        configMap:
          items:
          - key: sample-config.yaml
            path: sample-config.yaml
          - key: sample1-config.yaml
            path: sample1-config.yaml
          name: sample-conf
          defaultMode: 0755

I saw the solution for creating configmap as below: configmap.yaml:

apiVersion: v1
kind: ConfigMap
metadata:
    name: sample-conf
data:
  {{ (.Files.Glob "test/**.yaml").AsConfig | indent 4 }}

But how to use Asconfig function to prepare configmap with key: value as expected (above)? Also how to do iteration for the same in da-statefulset entries? As a note, I won't have these file names or its content inside values.yaml

It would be helpful if any one could help me on this. Thanks in advance!