Unfortunately, dovetail geometry is not supported in Carbide Create.
It is supported in Toolpath Language: https://tplang.org/ (enter as a stub endmill I think it is, and then set the upper and lower diameter appropriately)
I wrote a bit about using them at:
I’d just set them up to match the diameter you wish to cut at the surface and note the depth which they need to make a full-depth pass at in the description. Pair them with a toolpath from a smaller endmill which clears the central channel to allow the full-depth pass.