You don’t need to have a “Collision Responses” UPROPERTY to set default values inside of the constructor. You can simply use the function:
CollisionMesh->SetCollisionResponseToChannel(ECollisionChannel::*CHANNEL TO CHANGE THE RESPONSE OF*, ECollisionResponse::*NEW RESPONSE*);
To read the collision response values you can use: CollisionMesh->GetCollisionResponseToChannel(ECollisionChannel::*...*); and store it in an ECollisionResponse variable.