Sorry, there is not way to have it working the way you explained. Your CouchApp uses AJAX and does calculations using the javascript engine of the browser. Httplib will only get the html page for you, it won't evaluate the scripts.
What you probably need to is to have your data prepared in the list function instead of the couchapp. This is something you can easily invoke using httplib, its fed with the list of documents from the view and can return any http response.
Good luck!