dnd 5e – What are the stats of a magebred animal?

In Eberron: Rising from the Last War, magebred animals are mentioned from time to time in connection with House Vidalis. We’re told that a House Orien coach drawn by magebred draft animals travels a certain speed at a certain cost, that magebreeding involves dragonshard focus items, and that “this results in a superior version of a creature-an animal that is stronger, faster, and smarter.”

Okay, so I have a player who has expressed interest in investing in a magebred warhorse… and the book says absolutely nothing about that. Are they for sale? What do they cost? What stats do they have, and what’s their CR? I don’t know what to do here.

The book has a stat block for Valenar animals, which are a sort of fey spirit in the form of an animal, but those don’t seem at all appropriate for what I need — that’s more of your fantasy-YA-novel telepathic animal companion.

I know the original 3rd Edition Eberron campaign setting book had a template to apply to an animal to make magebred versions, but that seems entirely inappropriate since the whole system just doesn’t work the same way in 5e.