How to import 3D environments?

Forgive me if this has been answered already. I looked in the “Building, Viewing, and Sharing” forum and couldn’t find this exact issue. I am a history teacher and I want my students to create a virtual museum. I have zero coding experience but I can learn as long as it’s not too crazy. As I’ve been looking at options I came across Sketchfab, which has some precreated virtual spaces like this one and this one. Is it possible to upload these spaces into CoSpaces?