Convert prefab to entity at runtime

How can I convert to an Entity from prefab, just like GetEntity() from Baker?
because how would I load prefabs from the cloud storage?

Runtime Conversion is fully removed for after Entities 1.0, the only way to use Baking is through Sub Scenes!

You can convert anything you need to entity, then cache it in a component data, anytime you need, just looking for it and Instantiate with ECB or EntityManager!