Right now, the core strength of the software is opening theory. Endgames are part of the longer-term vision and will be developed carefully after the minimum viable product is in place.
Learn essential endgame concepts through organized chapters and practical examples.
Play out key endgame situations against the computer to reinforce technique.
Measure improvement across lessons and chapters just like opening training.
Basically, what I did for opening theory I hope to do for endgames. It will probably be slightly different in functionality though.