https://www.pbainbridge.co.uk/2021/09/send-data-to-google-form-via-apps-script.html

Send data to a Google Form via Apps Script.gs

/*
Create a prefilled URL for a Google Form with 2 questions on it.
*/

function prefillURL() {

  try {
    // data to pass to Google Form
    var shoeSize = 8;
    var someText = 'The Gift of Script';

    // URL of Google Form
    var formUrl = "ENTER YOUR GOOGLE FORM URL HERE" + "/formResponse?";

    // Google Form question ID and relevant data appended
    var formData = "&entry.ENTER YOUR QUESTION ID HERE=" + shoeSize + "&entry.ENTER YOUR QUESTION ID HERE=" + someText;

    // combine the above URLs
    var finalUrl = formUrl + formData;
    Logger.log(finalUrl);

    var options = {
      "method": "post",
    };

    UrlFetchApp.fetch(finalUrl, options);
  }
  catch (e) {
    Logger.log('Error is: ' + e);
  }
}