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using OnlineSubsystemGoogle in iOS, GoogleExternalUI is commented

Cannot use OnlineSubsystemGoogle in iOS.
I found below code in OnlineSubsystemGoogle.cpp ( Source/Private/iOS )

...
//#include "OnlineExternalUIInterfaceGoogle.h"
...

bool FOnlineSubsystemGoogle::Init()
{
...		
		//GoogleExternalUI = MakeShareable(new FOnlineExternalUIGoogle(this));
...
}

So, both of OnlineSubsystemGooglePlay and OnlineSubsystemGoogle are cannot use in iOS.
How I Google login in iOS ? I cannot found in Marketplace too. Make native plugin?