I wish there was a "fast API" for password managers. You can help them autocomplete by using `type` and `autocomplete` attributes in your login form, and there is a "well-known" URL to find the password change form, but I wish there was a way to bypass the HTML page entirely. This would get us 99% of the features of Passkeys I think, where the user only interacts with the password manager's UI.
If you _had_ to you your passkey you'd probably have to install 1Password + the extension in your browser. This is definitely not a great workaround.