I would like to suggest the ability for an "associate password entries" or similar option when creating a relation.
In the case of any asset, all passwords of that asset should show up within the password section of the current item you are viewing.
In the case of a password, it will just be directly in the password section.
The passwords ideally should have a tint/highlight or a symbol to show it is a relation password.
A use case would be - Creating a domain registrar asset for a client that includes the password to login, then associating the registrar (or direct password from the registrar) with the domain(s).
Now, when I go to the domain, the password I need is directly on the asset and whilst only saving a click, it makes navigation and usability better.