How to serialize TArray< MyClass*> ?

I’ve not tried out your setup yet but what you could do instead is something like the following to save your tree (the code is not tested though, just written here ^^):

FORCEINLINE FArchive &operator <<(FArchive &Ar, USaveBranch& SB)
{
	Ar << SB.text;

	if (Ar.IsLoading())
	{
		int32 NumBunches;
		USaveBranch SaveBunch;

		Ar << NumBunches;
		for (int32 ObjIndex = 0; ObjIndex < NumBunches; ObjIndex++)
		{
			Ar << SaveBunch;
			SB.moreTexts.Add(SaveBunch);
		}
	}
	else if (Ar.IsSaving())
	{
		int32 NumBunches = SB.moreTexts.Num();
		Ar << NumBunches;
		for (int32 ObjIndex = 0; ObjIndex < NumBunches; ObjIndex++)
		{
			Ar << SB.moreTexts[ObjIndex]
		}    		
	}

	return Ar;
}

The idea is to serialize the items in the array itself.