Extend CMS Capability with Custom Code

Hey everyone,

As a Webflow enthusiast, I am always looking for ways to get creative with the platform. A great app I have recently been following, Zestful (app.zestful.com), appears to be built in Webflow with the exception of some custom code.

Within the app, they appear to use collection lists to showcase their Catalog Products, but what throws me is that they have been able to extend their collection list limit well past 100, extending beyond even 200 or as many as they appear to need.

Is this a known thing that is possible within Webflow? If so, how can something like this be achieved? If not, is it an enterprise-grade feature?

I will settle for being able to get multi-reference fields in HTML embeds.