It can directly do dovetails — you just need to make a jig and create the toolpaths manually and create the cuts without any sort of 3D visualization in Carbide Create — you might be able to find a 3rd party tool for this: https://www.shapeoko.com/wiki/index.php/Previewing_G-Code https://www.shapeoko.com/wiki/index.php/Previewing_G-Code
There is a file on the link which you didn’t click: CNC Box (Finger) Joint Box