How to get host and swarm info with promtail?

We used to loki log plugin but we decided turn on to promtail because plugin demands from loki to have ports bind to a host.
How with promtail get labels: host, stack & service like loki log plugin do?

Here is my promtail’s config

server:
    http_listen_port: 9080
    grpc_listen_port: 0
positions:
    filename: /tmp/positions.yaml

client:
    url: http://loki:3100/loki/api/v1/push

scrape_configs:
    - job_name: containers
      static_configs:
          - targets:
                - localhost
            labels:
                job: containerlogs
                path: /var/lib/docker/containers/*/*log
      pipeline_stages:
          - json:
                expressions:
                    stream: stream
                    attrs: attrs
                    tag: attrs.tag
          - regex:
                expression: ^(?P<image_name>([^|]+))\|(?P<container_name>([^|]+))$
                source: 'tag'
          - labels:
                image_name:
                container_name:
          - match:
                selector: '{container_name="",image_name=""}'
                action: drop
          - match:
                selector: '{container_name=~"^stack_proxy.*"}'
                stages:
                    - json:
                          expressions:
                              log: log
          - labeldrop:
                - filename
          - output:
                source: log