Using Webflow for App

I’m using Webflow for a marketing site (site.com). We have a custom built app connected to it for purchases, account info, etc. (app.site.com).

I want to use Webflow to design pages for app.site.com. I understand about exporting code, but many of these pages house important CMS information, and I’m not sure the best way to handle this.

Should I export the code and self-host CMS data, refreshing when we can? Or is there another way?