Widget Blueprint - Widget Tooltip - Widget Blueprint Not Bindable (Possible bug?)

I was able to do this. You’ll need to use C++.

if (const auto Widget = NewObject<UUserWidget>(this, EffectTooltipWidgetClass))
{
	if (const auto Tooltip = Cast<UEffectTooltip>(Widget))
	{
		Tooltip->SetEffectInformation(
			InGameplayEffect->GetDisplayName(), InGameplayEffect->GetDescription()
		);

		SizeBox->SetToolTip(Cast<UWidget>(Widget));
	}
}

There’s no way of doing it currently in blueprint.