Sure, you can see the examples here, including exports:
https://github.com/EsotericSoftware/spine-runtimes/tree/4.0/examples
The stretchyman project uses paths, here is the part of the JSON that describes the vertices:
https://github.com/EsotericSoftware/spine-runtimes/blob/4.0/examples/stretchyman/export/stretchyman-pro.json#L521-L526
They are accessible at runtime using PathAttachment vertices. See the docs there though, the vertices are different when the path uses weights. Off the top of my head, I believe the vertices have 3 pairs for each knot on the path:
x,y for the "before" Bezier control point
x,y for the knot
x,y for the "after" Bezier control point
