Shared routes in reitit

I imagine that if I share clj and cljs reitit routes, I can centralize not only the routing but also parameter specification and coercion. But the examples given at https://metosin.github.io/reitit/advanced/shared_routes.html only share the route paths between clj and cljs, there are no example of sharing :parameters or :responses keys. I would prefer without reader conditionals, so that the routes are in one ns, and clj and cljs handling of the routes are in separate namespaces.

How would one for example share these reitit example routes between clj and cljs? Found at https://github.com/metosin/reitit

(def app
  (ring/ring-handler
    (ring/router
      ["/api"
       ["/math" {:get {:parameters {:query {:x int?, :y int?}}
                       :responses {200 {:body {:total pos-int?}}}
                       :handler (fn [{{{:keys [x y]} :query} :parameters}]
                                  {:status 200
                                   :body {:total (+ x y)}})}}]]
      ;; router data effecting all routes
      {:data {:coercion reitit.coercion.spec/coercion
              :middleware [rrc/coerce-exceptions-middleware
                           rrc/coerce-request-middleware
                           rrc/coerce-response-middleware]}})))