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You could use the Feature Suggestions forum to make such a suggestion, or vote for an existing one (maybe there are more, but I found this one via a quick search).
Dominique | Finland
Ionic, Aria, Flyer, TrendWeight | Windows 7, OS X 10.13.5 | Motorola Moto G6 (Android 9), iPad Air (iOS 12.4.4)
Take a look at the Fitbit help site for further assistance and information.
Last year I switched to a Garmin device and my daughter got really upset with me because we could no longer be Fitbit friends and challenge each other. I found an app that would let us do that. Its called StrideKick.