How to associate a credentials with an app?

Hi I came across this post and had the same frustration.

I would like at least the “Suggested Items” to be non-blank. Ideally it should display items filled by frequency or last used ones, and we could pin a few frequently used passwords there. Otherwise it’s very annoying to select search box on the top and manually search through “other logins” which is ordered by name, then click “Allow once” for apps that doesn’t provide the associated domain info.