There is a new experimental flag in the last Chromium Build for Mac that you might be interested in.

Once you've enabled the chrome://flags/#enable-password-manager-reauthentication flag, user who's trying to reveal a plain text password in chrome://settings/passwords will be prompted to reauthenticate with the User Mac OS password.

When you are authenticated, you won't need to reauthenticate anymore for one minute. 

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