Hi Rasmus,
I think what you are describing is too far of a reach. You'd need to put the data you are trying to get on the News entity that is directly attached to the Email Send somehow.
You've probably already looked at this but just in case, and for anyone else looking at this- see this article for how this functionality works and the format of the FreeMarker when connecting a record to the Email Send: http://blog.clickdimensions.com/2011/10/merge-any-custom-or-standard-entity-data-into-clickdimensions-emails.html