Set Class Input in SpawnActor function

Hey there! I have got a simple question: I want to spawn an Object ItemOnePickup using the SpawnActor function. Here I need to select an class. No problem, the Object is an seperate Blueprint. BUT this class has got an varibale ItemID that is used as Input. So I can set it e.g. in the editor. How can I set this Input Variable in the SpawnActor?

Thank you!