Access logging only on gateways

Is there a way to enable access logging only on the gateways? I tried the following EnvoyFilter but it doesn’t seem to add anything to the Envoy config.

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: envoy-access-logging-ingress
  namespace: istio-system
spec:
  configPatches:
  - applyTo: NETWORK_FILTER
    match:
      context: ANY
      listener:
        filterChain:
          filter:
            name: envoy.http_connection_manager
        portNumber: 443
    patch:
      operation: ADD
      value:
        config:
          access_log:
            name: envoy.file_access_log
            typed_config:
              "@type": "type.googleapis.com/envoy.config.accesslog.v2.FileAccessLog"
              path: "/dev/stdout"
  workloadSelector:
    labels:
      app: istio-ingressgateway

Hi phhoj, i was able to use below to enable access logging only on the gateways with json format

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: access-log
spec:
  workloadSelector:
    labels:
      istio: ingressgateway
  configPatches:
  - applyTo: NETWORK_FILTER
    match:
      context: ANY
      listener:
        filterChain:
          filter:
            name: "envoy.http_connection_manager"
    patch:
      operation: MERGE
      value:
        typed_config:
          "@type": "type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager"
          access_log:
            - name: envoy.file_access_log
              config:
                path: /dev/stdout
                jsonFormat:
                  authority: "%REQ(:AUTHORITY)%"
                  bytes_received: "%BYTES_RECEIVED%"
                  bytes_sent: "%BYTES_SENT%"
                  downstream_local_address: "%DOWNSTREAM_LOCAL_ADDRESS%"
                  downstream_remote_address: "%DOWNSTREAM_REMOTE_ADDRESS%"
                  duration: "%DURATION%"
                  istio_policy_status: "%DYNAMIC_METADATA(istio.mixer:status)%"
                  method: "%REQ(:METHOD)%"
                  path: "%REQ(X-ENVOY-ORIGINAL-PATH?:PATH)%"
                  protocol: "%PROTOCOL%"
                  request_id: "%REQ(X-REQUEST-ID)%"
                  requested_server_name: "%REQUESTED_SERVER_NAME%"
                  response_code: "%RESPONSE_CODE%"
                  response_flags: "%RESPONSE_FLAGS%"
                  route_name: "%ROUTE_NAME%"
                  start_time: "%START_TIME%"
                  upstream_cluster: "%UPSTREAM_CLUSTER%"
                  upstream_host: "%UPSTREAM_HOST%"
                  upstream_local_address: "%UPSTREAM_LOCAL_ADDRESS%"
                  upstream_service_time: "%RESP(X-ENVOY-UPSTREAM-SERVICE-TIME)%"
                  upstream_transport_failure_reason: "%UPSTREAM_TRANSPORT_FAILURE_REASON%"
                  user_agent: "%REQ(USER-AGENT)%"
                  x_forwarded_for: "%REQ(X-FORWARDED-FOR)%"

Worked for me, thank you so much!