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[Reflection] Struct instance from UStruct

Hi all, I have a lot of questions about the workings of the reflection system.

How to get a wild structure instance from UStruct*?
As I understood UStruct* is a reference to a structure in the UnrealEngine memory model, but when using UStruct* with CustomThunk such a field accepts any structure as input.

UFUNCTION(
         BlueprintCallable,
         Category = "Item Creation",
         CustomThunk,
         meta = (
             Keywords = "Convert Struct to Item",
             CustomStructureParam = "ItemStruct"
         ))
    UGameItem* CreateItem(UStruct* ItemStruct);

	DECLARE_FUNCTION(execCreateItem)
	{
		Stack.Step(Stack.Object, nullptr);
		FProperty* StructProperty = CastField<FProperty>(Stack.MostRecentProperty);
		void* StructPtr = Stack.MostRecentPropertyAddress;

		P_FINISH;

		P_NATIVE_BEGIN;
		*static_cast<UGameItem**>(RESULT_PARAM) = P_THIS->HandleStruct(StructProperty, StructPtr);
		P_NATIVE_END 
}

And a quick question: how can I simulate the work of CustomThunk so that I can use a function from C++ the same way as I use it from Blueprints?