Those forms don't exist in SWSH, thus the menu for them doesn't appear.
If you like, here's some alternatives:
1. Modify the source code of PKHeX, make your own branch.
2. If you don't want to modify the source code, use batch editor to edit the forms of what you're viewing. :3
3. Dragging in one of them in the alt-forms, from lower gen to current gen.
This is all I can think of for now. ><