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I have figured it out

Nice! Please share

Sure. In my helm templates I created the following ConfigMap:

apiVersion: v1
kind: ConfigMap
metadata:
  labels:
    app: druid
    release: druid
  name: druid-metrics-file
  namespace: "{{ .Values.namespace }}"
data:
  metrics-dimensions.json: |
    {{ toJson .Values.metrics | indent 4 }}

I have a

values.yaml

file with all the config, among them the metrics:

metrics:
  query/time:
    dimensions:
      - dataSource
      - type
    type: timer
    conversionFactor: 1000
    help: Seconds taken to complete a query.
  query/bytes:
    dimensions:
      - dataSource
      - type
    type: count
    help: Number of bytes returned in query response.
...

You might ask why I have metrics as yaml in values.yaml file. Reason is https://stackoverflow.com/questions/73468386/how-to-add-json-data-in-configmap-creation-in-argocd I then added a volume in each deployments (broker, coordinator and router) as well as statefulsets (historical and middleManager):

volumes:
        - name: metrics-conf
          configMap:
            name: druid-metrics-file
            items:
              - key: metrics-dimensions.json
                path: metrics-dimensions.json

Then you need to mount the volume:

volumeMounts:
            - name: metrics-conf
              mountPath: /opt/druid/conf/druid/metrics-dimensions.json
              subPath: metrics-dimensions.json
              readOnly: true

And finally the env var in the container:

- name: druid_emitter_statsd_dimensionMapPath
  value: "/opt/druid/conf/druid/metrics-dimensions.json"

Hope it helps!

Awesome, thanks for sharing.