BikeCAD 24.0 includes the full catalog of road and gravel stems from ENVE.
To access these stems, switch the menu from Define by parameters to Define by static drawing.
A new menu will appear containing all the sizes of Aero In-Route, High Rise In-Route and Standard Road. Note that each Standard Road stem is listed twice: once with a plus sign and once with a minus sign. These are both the same stem. They're just listed twice to show that they can be mounted angled down or flipped around and mounted angled up.
Designs exported to FreeCAD will include the stem in the FreeCAD model.