Earlier quoted context omitted.
Any Apple engineers reading this, please give users control over this. This is a privacy hole.
Don't think they can. Keychain is supposed to be a secure storage solution, so I can't imagine they want users to be able to view that data, and it would be hard to manage it without knowing what it was. That said, I found a post from last year saying that they would like to phase key-chain persistence out at some point, but it was fairly free of actual commitments.
> Keychain is supposed to be a secure storage solution, so I can't imagine they want users to be able to view that data
This seems at odds with the fact that macOS comes with a built-in app called "Keychain Access" that allows you to view the contents of the keychain (including iCloud keychain).