Flutter 如何在Flatter使用的插件InAppWebView中将查询参数附加到链接打开

我使用InWebAppView，所以如何在url中添加查询参数，例如当按下按钮registreation必须将参数附加到ur时，必须在InWebAppView中调用func以实现发送参数的是调用this shouldOverrideUrlLoading或其他

if (uri.toString().startsWith(
                        'https://www.emtehanat.net/ar/register/student')) {
                    
                      var url = Uri.parse(
                          'https://www.emtehanat.net/ar/register/student');
                      var queryParams = ((url.hasQuery) ? '&' : '?') +
                          "fcm_token=" +
                          '${fcmToken}' +
                          "&" +
                          "device_id=" +
                          '${deviceId}';

                      var newUrl =
                          'https://www.emtehanat.net/ar/register/student' +
                              queryParams;
                      

                      controller.loadUrl(
                          urlRequest: URLRequest(url: Uri.parse(newUrl)));
                      return NavigationActionPolicy.CANCEL;
                    }