Alright thank you Philippe,
My suggestion defers a bit from the one David suggested, but his suggestion is also valid.
The datasmith scene actor isn’t the way to go currently. It’s mostly used as an internal mechanism for datasmith. During a reimport, this actor is used by datasmith to found which actors are related to the scene. The code that creates the actors under the datasmith scene actor is currently very bound to the editor and this is why it’s not currently exposed to the blueprints.
That being said, there are many ways to work around that and achieve your objective. Such as this one.
You could use the blueprint system to create some “prefabs” assets out of your datasmith imports.
And once you have your collection, you can spawn those “prefabs” in a normal blueprint.
I hope this can help you,