How do you configure UProperty data on classes that derive from UUserWidget?

Development Programming & Scripting UI
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How do you configure UProperty data on classes that derive from UUserWidget?

As an example,

UCLASS()
class UUMGBaseWidget : public UUserWidget
{
	GENERATED_BODY()
	
public:

protected:
    UPROPERTY(EditDefaultsOnly)
    int32 MyProperty;
};

MyProperty doesn’t show up anywhere in the UMG Editor. I’ve tried this with numerous other data types and nothing has worked. The only thing that I have seen that’s worked is binding widgets. TSubclassOf doesn’t work either.

For more context, I need to create 40 instances of a derived UUserWidget programmatically (as I don’t want to drag and drop 40 of them in the UMG editor), so I was hoping to use TSubclassOf<> and other UProperty data to do so.