I just used this feature (as a plugin) in KeePass and think this would also suit bitwarden.
Corporate accounts nowadays have to reset their password every 3-12 Months. Would be great if bitwarden gives me a notification every X months repeatedly so I don’t forget it.
Maybe add it to the advanced features of the login fields. But selecting the amount of Days/Weeks/Months or so to get a notification to change the password would be nice.
If you are unsure on how I imaginate this feature to be, check out this KeePass plugin.