How do I do the equivelant of the following Xdoclet using Hibernate annotations?

/**
* ...
* @hibernate.map table="settings" lazy="true"
* @hibernate.collection-key column="id"
* @hibernate.collection-element column="value" type="string"
* @hibernate.collection-index column="setting_key" type="string"
*/
public Map<String, String> getSettings() {...}

I've read through the documentation a number of times and have been playing with this for hours with no success.

I think it is impossible to have equivalent since in javax.peristence Map could be mapped only with key (map key) as property from value (map value) object.

I'm reasonably certain it can't be done with JPA annotations but are there or will there be Hibernate specific annotations for doing this?