oh yeah i know about toroid inner circle areas like that. but why can't that property of the wormhole be extended into a whole space?
I believe if you tried to take these areas of local hyperbolic geometry and extend them, you'd end up with a lot of self-intersections (unless you're in 6D and have extra dimensions to extend into). You can see this visually in this part of this video by CodeParade, creator of Hyperbolica. The crocheted hyperbolic plane gets really cramped as it is extended outwards and would continue to get more cramped if it were larger.
I also could theoretically try to deal with self-intersection, but it might be difficult, especially in the case of the hyperbolic 3D-plane.