Using "meta" labels on a pipeline

OK, I’m trying to convert some JSON log fields into Labels but i must be doing something terribly wrong. Here’s what I have:

scrape_configs:
  - job_name: kubernetes-pods
    kubernetes_sd_configs:
      - role: pod
    pipeline_stages:
    - cri:
    - match:
        selector: '{k8s_namespace_name=~"traefik"}'
        stages:
        - json:
            expressions:
              ClientHost: ClientHost
              RequestHost: RequestHost
              RequestMethod: RequestMethod
              RequestPath: RequestPath
              RequestScheme: RequestScheme
              request_User-Agent: UserAgent
            labels:
              ClientHost:
              RequestHost:
              RequestMethod:
              RequestPath:
              RequestScheme:
              UserAgent:

I never get the labels on the “traefik” logs. I also tried with “__meta_kubernetes_namespace” label instead of k8s_namespace_name (that get’s created on the relabel_configs section.

What am I doing wronghere? :frowning: