Would be a very pleasant feature indeed !
When I’m going to a page protected with basic authentication, the popup opens.
I need to close it, copy the password from Passbolt (fortunately mu usernames are short), refresh the page, paste the password, and fill the username.
If my username was hard, it would be even more difficult to do.
I put the link to another topic on the Passbolt forum talking about this feature : Htaccess credentials via passbold - #10 by androot
And also the Bitwarden commit that implements that feature :