Either multiple different keychains or even you can have no keychain-like application in your system at all.
The WiFi passwords are usually stored in /etc/NetworkManager
as plain files. Granted, they are not accessible directly by non-root users as they are being managed by the NetworkManager daemon, but there is nothing generic for such a thing. Signal rolling a similar daemon for itself would be an overkill. The big desktop environments (GNOME, KDE...) usually have their own keychain-like programs that the programs provided by these environments use, but that only solves this problem for the users of these specific environments.
To me it's perfectly expected the Signal encryption keys are readable by my user account.
My point was that apart from the Macs, there is no single system keychain Signal could use. What they do is perfectly normal and expected on a desktop OS.