How to use Dialogflow CX API pass parameters to webhook？It seemed that detectIntent() set session queryParams does not work

According to the google dialogflow cx document: https://cloud.google.com/dialogflow/cx/docs/concept/parameter https://cloud.google.com/dialogflow/cx/docs/reference/rest/v3/QueryParameters

click to show the reference I know we can use api to set session parameters. So I want pass the parameters to webhook by API way.

Step 1:Front-end, use detectintent() API, fill the queryParams item. Step 2:Google dialogflow cx server will set parameters as the session parameter. Step 3:Webhook receive the google-side fucnction call.We can found all of the session parametersin from the http request.

As far as I am concerned, I can only receive the variables set in the DialogFlow Agent, but I have not received any information set through the API. I think I must have done something wrong, who can tell me how to? thanks.

My code as below(Nodejs code):

  const sessionPath = client.projectLocationAgentSessionPath(
    projectId,
    location,
    agentId,
    sessionId
  );
 
  var mapParameters = new Map([['Michael', 95], ['Bob', 75], ['Tracy', 85]]);
 
 const request = {
    session: sessionPath,
    
    "queryInput": {
      
      "text": {
        "text": query,
      },
      languageCode,
    },

    'queryParams': {
      'timeZone': 'America/Los_Angeles',
      'parameters': {
        "fields":mapParameters
      }
    },

 };
const [response] = await client.detectIntent(request);

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