Another good news is that the Autofill feature is not only compatible with the Chrome password manager, it also works like a charm with third-party password managers.
The method to configure Autofill for third-party password managers is similar to the method explained above. All you have to do is select the said app in the Autofill service and tap OK on the notification card.
So, the next time you need your login credentials to be auto-filled, you'd just have to tap on the username field and the card asking you to verify your master password or fingerprint (depending on your password manager) will be displayed. After the verification, you'll be safely logged in to the app within just a few seconds.