'{{ .field }}' syntax does not seem to work with Loki synk

[yogeek]

In Loki receiver configuration, it does not seem possible to use templated values for stream labels like in other sinks.

For example, in Slack sink we can use the templated fields {{ .xxx }}:

receivers:
  - name: "slack"
    slack:
      channel: "@{{ .InvolvedObject.Labels.owner }}"
      message: "{{ .Message }}"
      fields:
        namespace: "{{ .Namespace }}"
        reason: "{{ .Reason }}"
        object: "{{ .Namespace }}"

I tested this config with Loki sink but the {{ .xxx}} part is not rendered before sending to loki :

receivers:
  - name: "loki"
    loki:
      streamLabels:
         source: event-exporter
         container: event-exporter
         namespace: "{{ .InvolvedObject.Namespace }}" # <<<< this does not work

Is it possible to add some of the event fields like the namespace as loki labels please ?

[yogeek]

UPDATE : in fact, after some tests, I discovered that the minimal configuration above works well for the corresponding dashboard

receivers:
      - name: "loki"
        loki:
          url: http://loki-gateway.loki.svc.cluster.local/loki/api/v1/push
          streamLabels:
            source: event-exporter
            container: event-exporter