You can add a Curved Poly Model to your Scene by adding a Curved Poly Component to any Game Object in Unity.
Curved Poly Models can then be generated and stored in a Unity Project in many ways. Section Assets Workflow has an in depth covering of all the possibilities.
On the Curved Poly Component there are different ways to work on the result of Curved Poly Processes. You could just use Curved Poly has a mesh generator, or you can use Curved Poly at runtime. Whatever is your path, the Component offers many options and informations about how meshes are generated from the model.