Welcome to the forum @abhibeckert
While waiting for this to happen (or not), there are lots of dedicated programs that do this sort of thing.
Visualize backup data usage gets into it a little bit with one specific recommendation, and others exist.
Disk Space Analyzer WizTree 4.00 has been released talks about the new June 10, 2021 version.
Some of these tools probably also have a nicer graphical UI than Duplicati can do, as a web page.