async def METHOD_NAME(cls, client: GraphQLClient) -> str:
    """Determine whether the GitLab instance has the approved field for merge requests."""
    response = await client.execute(MERGE_REQUEST_FIELDS_QUERY)
    json = await response.json()
    fields = [field["name"] for field in json["data"]["__type"]["fields"]]
    return cls.APPROVED_FIELD if cls.APPROVED_FIELD in fields else ""