How to add an url to the embedded app, which would not require authentication?

We are building Shopify embedded app using the recommended shopify embedded app cli, which uses node js, next js and react. Now we have our embedded application ready, but we need to create an additional route in our server, which would render a particular page, which does not require shopify authentication. Basically that page should be access from the web, by simply typing www.ourp.app/custom_public.
Let me know, how can i configure the router and server. Or maybe it is not needed?