Composite steps in text format

Maybe some more background information why I posted this feature request. We started using the Gherkin syntax for our stories in order to talk about features instead of stories. Gherkin is missing the givenStories feature and I was looking for an alternative for our customer to write the setup of their scenarios (description of transportation infrastructure: ex. Given a Route R between endpoint A and endpoint B ... And Route R has distance 1500m ...).
With this feature he could write Given the infrastructure (followed by a more functional explanation and hide the low level setup of the infrastructure in a separate composite step file)

Could you share some ideas on the possible syntaxes that could be used?

The syntax could be very similar as @Composite but in a <my_composite>.step file:

Composite: Given %customer has previously bought a %product
Alias: <customer> has previously bought a <product>

Steps:
Given <customer> is logged in
Given <customer> has a cart
When a <product> is added to the cart

I suppose a special InjectableStepsFactory could locate these .step files, load them and process them similar as @Composite?

We could have the composite step file in a textual format but it would still need to declared in a steps class, e.g.

@Composite("<my_composite>.step")
public void myComposite(){
}

The InjectableStepsFactory creates steps classes, which are then used to find annotated methods that match the textual steps.

Would that work for you?

If you can declare multiple composite steps in the file, it would work for me. Otherwise a non-technical person still depends on a programmer to do a code change and add for every new composite step a class.
Or maybe we can add a directory to the annotation? Jbehave can search in this directory for composite steps?