I'm not quite sure I understand your question. Named Queries do allow for supplying parameters to the query. To do so, select your Named Query in the Project Browser, and in the Authoring tab add a parameter (and then use that parameter within the query). Save your chnages, and then use that Named Query in your binding. There will be an input field which allows for specifying the parameter of the Named Query as an expression.
This post in a different thread should give you a better visual, though note that the post is parameterizing the database instead of a value of the query.