When adding a new password from a website, bitwarden could fetch HOSTNAME/.well-known/assetlinks.json (like this one)
To initiate the URI set, and automatically suggest the password for affialiated websites.
That would allow a password save to website_dot_com properly configured, to suggest the password on website_dot_fr if it’s an associated domain.
The permission that needs to be checked is “delegate_permission/common.get_login_creds”.
Here are some specs about this assetlinks file format.