Carbide Create does not support that tool geometry.
One can cut them, just one has to take the 3D appearance of the cut on faith:
For what you show above, you can just assign a No Offset Contour toolpath using the dovetail tool (might want to clear the central part first) — you’ll just have to have the geometry double back on itself.
Alternately, if it’s not too long, use a keyhole toolpath.