How to read Niagara user parameters from Blueprint?

Development Asset Creation FX
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10

in your .H

	UPROPERTY(EditDefaultsOnly) 
	TObjectPtr<class UNiagaraComponent> Niagara = nullptr;

	float SpriteSize=200.0f;

In your .CPP

Niagara->SetVariableFloat("SpriteSize", SpriteSize);

if you want a vector, then do it like this:

Niagara->SetVariableVec3("SphereOrigin", Location);