I want to share Keychain data with iPhone with different Apple ID
Many people have asked how to do this, and the answer is usually that you can't. However, I see that one user asked a question with this title "Keychain shared with family despite different accounts" and said that "my family and I are signed into our own Apple IDs on our own devices, but all of our keychain passwords are shared with each other. For example, if they visit a website that I have an account for, my password will be suggested by auto-fill."
This user wanted to stop doing this. I want to start. If they are doing it, how can I make it happen for my wife and I on our shared iMac and our two separate iPhones?