Iirc there’s a Magit-like tool for jj that released somewhat recently, though I don’t know its name

Probably Majutsu, https://github.com/0WD0/majutsu

Fun name: seems like a reference to “Magit” both syntactically (being a portmanteau of “Magit” and “jujutsu”) and semantically (majutsu meaning “magic” in Japanese).