There’s one little feature for that: CustomPreSpawnInitalization.
FActorSpawnParameters ActorSpawnParameters;
ActorSpawnParameters.CustomPreSpawnInitalization.CustomPreSpawnInitalization = [&](AMyActor* MyActor)
{
MyActor.Health = 100;
};
GetWorld()->SpawnActor (MyActor::StaticClass(), &Location, &Rotation, ActorSpawnParameters);