How add information in user-agent ? QML Web View Android

[magalss]

i see example minibrowser for android, but me need add information imei phone

this default user-agent: "Mozilla/5.0 (Linux; Android 5.0.2; Redmi Note 2 Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.111 Mobile Safari/537.36"

need "Mozilla/5.0 (Linux; Android 5.0.2; Redmi Note 2 Build/LRX22G; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/63.0.3239.111 Mobile Safari/537.36 IMEI(----------------)"

How do it?

this function get IMEI
QString InfoDevice::getDeviceImei()
{
        QAndroidJniEnvironment env;

        jclass contextClass = env->FindClass("android/content/Context");
        jfieldID fieldId = env->GetStaticFieldID(contextClass, "TELEPHONY_SERVICE", "Ljava/lang/String;");
        jstring telephonyManagerType = (jstring) env->GetStaticObjectField(contextClass, fieldId);

        jclass telephonyManagerClass = env->FindClass("android/telephony/TelephonyManager");
        jmethodID methodId = env->GetMethodID(contextClass, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");

       QAndroidJniObject qtActivityObj = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative",  "activity", "()Landroid/app/Activity;");
        jobject telephonyManager = env->CallObjectMethod(qtActivityObj.object<jobject>(), methodId, telephonyManagerType);

        methodId = env->GetMethodID(telephonyManagerClass, "getDeviceId", "()Ljava/lang/String;");
        jstring jstr = (jstring) env->CallObjectMethod(telephonyManager, methodId);

        jsize len = env->GetStringUTFLength(jstr);
        char* buf_devid = new char[32];
        env->GetStringUTFRegion(jstr, 0, len, buf_devid);
        QString imei(buf_devid);
        delete buf_devid;
        return imei;
}