How to use the gcsfs.core.GCSFileSystem function in gcsfs

def __init__(self, project_id: str, bucket_name: str, 
            service_account_file: str):
        self._bucket_name = bucket_name
        self._client = storage.Client(project=project_id, 
                credentials=service_account.Credentials.\
                from_service_account_file(service_account_file))
        self._fs = GCSFileSystem(token=service_account_file,
                check_connection=True)

# The chunk size for uploading
chunk_size = 1024*1024*5

# GCP Service account credentials.
gcp_credentials = service_account.Credentials.from_service_account_file(
        gcp_configs.get("service_account_file"))

# The Google Cloud Storage client.
gcs_client = storage.Client(
        project=gcp_configs.get("project_id"),
        credentials=gcp_credentials)

# The GCSFileSystem interface
gcs_fs = GCSFileSystem(
        token=gcp_configs.get("service_account_file"),
        check_connection=True)


def get_object(bucket_name, blob_name):
    """Get a JSON object from bucket as a Python dictionary.

    Args:
        bucket_name: the name of the bucket.
        blob_name: the name of the blob object relative to the bucket.

    Returns: a Python dictionary.
    """
    blob = gcs_client.bucket(bucket_name).get_blob(blob_name)
    if blob is None:
        raise ValueError("Cannot find blob {}/{}".format(bucket_name, blob_name))