[Evolution] How to get a “new email” counter/badge to the Evolution app icon on Ubuntu Dock?

[theapple...@differentmail.com]

Hello!
Is there a way to add a "new email" counter/badge to the Evolution app
icon on Ubuntu Dock (Ubuntu 18.04)? The Thunderbird icon shows a
badge/counter/indicator with the new resp. unread messages.
Thanks for your help!
Dan
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