It is possible when you move the enumeration attibute to an entity which you associate to your original entity. Now you can use a reference selector (also dropdown). You can fill reference selector from microflow or constrain them with xpath.
Another option to keep your setup.
You could create a new entity(entity B) which als has an attribute with you enumeration. This entity contains a object/record for every enum value.
Associate this entity with your original entity (entity A).
In your 'entity A' form you build a reference selector (to 'entity B') with a xpath expression on it. Create an onchange event on the reference selector and equal the enumeration of entity A to entity B.
Entity Vehicle with attributes Description, WheelAmount and TypeOfVehicle is splitted up in entities vehicle and Vehicletype.
Move the attribute TypeOfVehicle to entity Vehicletype.