How to create a new ILM policy for Filebeat with Elasticsearch on Kubernetes?

Elastic Orchestration Elastic Cloud on Kubernetes (ECK)
1

I'm using ECK helm chart and created a Filebeat with Beat CRD:

apiVersion: beat.k8s.elastic.co/v1beta1
kind: Beat
metadata:
  name: quickstart
  namespace: default
spec:
  type: filebeat
  version: 8.17.3
  elasticsearchRef:
    name: quickstart
  config:
    filebeat.inputs:
    - type: container
      paths:
      - /var/log/containers/*.log
    output.elasticsearch:
      ilm:
        enabled: true
        policy_name: "filebeat_policy"
  ......

I created a filebeat_policy.json policy:

{
    "policy":{
       "phases":{
          "hot":{
             "actions":{
                "rollover":{
                    "max_age": "1d",
                    "max_docs": 10000,
                    "max_size": "10gb"
                }
             }
          },
          "delete":{
             "min_age":"30d",
             "actions":{
                "delete":{
                   
                }
             }
          }
       }
    }
}

But after I create policy this way:

curl -X PUT -k -u elastic:$ELASTIC_PASSWORD "https://localhost:9200/_ilm/policy/filebeat_policy" -H 'Content-Type: application/json' -d @./values/elastic/filebeat-policy.json

I can't find the filebeat_policy in the current Elasticsearch indices:

curl -X GET -k -u elastic:$ELASTIC_PASSWORD "https://localhost:9200/_data_stream/filebeat-*?pretty"

If I do this way, it works:

curl -X PUT -k -u elastic:$ELASTIC_PASSWORD "https://localhost:9200/_component_template/filebeat-settings" -H 'Content-Type: application/json' -d '
{
  "template": {
    "settings": {
      "index.lifecycle.name": "filebeat_policy"
    }
  }
}'
curl -X PUT -k -u elastic:$ELASTIC_PASSWORD "https://localhost:9200/_index_template/filebeat-8.15.3" -H 'Content-Type: application/json' -d '
{
  "index_patterns": ["filebeat-*"],
  "data_stream": {},
  "composed_of": ["filebeat-settings"]
}'

So my question is, if use Beat CRD, doesn't it work in config section below?

    output.elasticsearch:
      ilm:
        enabled: true
        policy_name: "filebeat_policy"