only one thing to notice, you need to add bellow code to your AppDelegate.cpp:
#ifdef SDKBOX_ENABLED
#include "PluginAdMobJS.hpp"
#include "PluginAdMobJSHelper.h"
#endif
#ifdef SDKBOX_ENABLED
se->addRegisterCallback(register_all_PluginAdMobJS);
se->addRegisterCallback(register_all_PluginAdMobJS_helper);
#endif