How to enable webflow and my other app products on the same domain

I want to host my marketing pages and product dashboard on the same domain. Webflow allows the hosting of the content on the custom domain (lets say but once done I am not able to handle to go to my product app server (AWS load balancer). Is it possible to do this?

One option I can think of is that
I fetch the webflow content (request content) on app server and then return everything from app server. That way I can host the marketing content on webflow and return everything from single domain.