I swear we had an issue for this but couldn't find it.
Anyway, for components, if we have no element property set in the serialization, assume
the label is the data-montage-id to search for.
To indicatethat a component should not immediately have an element (useful in some circumstances to avoid premature loading) explicitly set the element property to null.
@aadsm has already prototyped this feature in a branch, but to my knowledge, it has not been back-ported to our usual declaration deserializer.