V carving is a 3D process.
To remove facets you will need to use "cut arc fitting"
If cut arc fitting is not available in the MOP (IDK off the top of my head and haven't looked it up) then you will have to do it with toolpath editer (Pro product only).
Another potential option is to change the triangle mesh of your imported part. This may need to be done at the CAD level depending on your scenario.