Fusion chess

we could just play it right here .to notate fusion ,for example the rook to fusion with the h pawn, you just have to write: Rxh2

and if you want to defuse you just notate the piece that moves out of the fusion and the square it will go to

Perhaps it is similar or identical with Turnover Chess? Can be tested here: https://dagazproject.github.io/checkmate/turnover.htm
I don't think much of this game below but it does have nice quality pieces that split and join, what you call fusion.
The pieces could be used for many types of variants, quality of pieces a lot better than anything else that I have seen, might soon be available in wood or plastic.
I won't be buying it, not a big fan of fairy pieces.
https://www.kickstarter.com/projects/1633288420/chessplus-an-amazing-board-game-the-evolution-of-c