That's not available, and I think it's not recommended, as you can have a method that returns to you that required preftechPath tree and then use it inside the linq routine.
One way to do that is by using an include template and generate it You simply have to loop over relations in the entity and emit calls to the UtilizingPropertyName (the field mapped onto a relation). We didn't add these methods as they'll bloath the code and won't be used by a lot of people.