$https: {
      connectionName: "AzureChatGPT",
      method: "POST",
      as: "apiResults",

      // this means deserialize all json strings found in the response.
      config: { parseJsonStrings: true },
      payload: [
        {
          $project: {
            _id: 0,
            model: "gpt-4o-mini",
            response_format: { type: "json_object" },
            messages: [
.... 

{
    ...,
    choices: [
      {
        ...
        message: {
          content: '{"sentiment_score":0,"reasoning":"The conversation discusses various databases, including MongoDB and Oracle, but does not have a strong positive or negative sentiment overall. It reflects a neutral stance on the potential adoption of new technologies and their integration challenges.","orig_language":"English","streaming_score":0}',
        }
      },
       {
        ...
        message: {
          content: '{"sentiment_score":0,"reasoning":"The conversation discusses various databases, including MongoDB and Oracle, but does not have a strong positive or negative sentiment overall. It reflects a neutral stance on the potential adoption of new technologies and their integration challenges.","orig_language":"English","streaming_score":0}',
        }
      } 
    ],