The KeepassXC browser plugins do not work on many websites. It is absolutely not comparable to the quality of the 1Password plugins.
Currently I am testing Enpass, which works well so far.
Same concern here, that's why I made LockyWindow for Keepass (original). It's a shame there isn't a way to use an interchangable format at the OS level for Macos Keychain, Gnome Keyring, Windows crypto, etc.