SSH Bookmarks - broken on macOS

Heureka!

Just a few more hours and it works. Key paragraph in docs (ideally to be reworked) https://developer.1password.com/docs/ssh/bookmarks/#use-the-configuration-file.

• Include must be on top of ~/.ssh/config
• followed by Agent
• followed by Host definitions

Example (this would have helped me tremendously):

# use 1Password to manage ssh key assignment to logins (ssh bookmarks)
Include "~/.ssh/1Password/config"

# use 1Password as Identity Agent
Host *
  IdentityAgent "~/Library/Group Containers/2BUA8C4S2C.com.1password/t/agent.sock"
  # IdentityAgent "~/.1password/agent.sock"

###
###  Home Assistant
###

Host homeassistant
  HostName homeassistant.local
  User root
  Port 222     # using a non-standard port

In 1Password define the custom url field:

url
ssh://homeassistant

And by the way, this also addresses the question of how to use a different port than 22/tcp for ssh connection.