Yes, you can use the Profile from Curves block to create closed profiles from input curves.A Profile is a set of coplanar curves. It has two field properties: the first is the Signed Distance field to the infinite extrusion relative to the profile’s plane and the second is the unsigned distance field to the enclosed region.
A Profile can also be closed or open. If closed, it can have multiple loops (e.g. several circles inside a rectangle or the disconnected loops of a logo). Open profiles are semi-infinite and can be used in the same blocks as closed profiles.