code: def save_foreach_cardinality(
      self, foreach_split_task_id, foreach_cardinality, ttl
  ):
      return self._client.put_item(
          TableName=self.name,
          Item={
              "pathspec": {"S": foreach_split_task_id},
              "for_each_cardinality": {
                  "NS": list(map(str, range(foreach_cardinality)))
              },
              "ttl": {"N": str(ttl)},
          },
      )
  
file_path: metaflow/metaflow/plugins/aws/step_functions/dynamo_db_client.py
imports: import os
  import requests
  from metaflow.metaflow_config import SFN_DYNAMO_DB_TABLE
label_desc: Use image node_id 2 for calling the DynamoDbClient obj's underlying member method code with example usage: obj.save_foreach_cardinality(foreach_split_task_id, foreach_cardinality, ttl) and returns: self