Thank you for your feedback. We’ve just added a bucket chart to the Planner charts view!
Go to tasks.office.com to check it out and let us know what you think! “Leave feedback” from the setting menu or tweet using #MicrosoftPlanner.
The Planner Team
An error occurred while saving the commentAlex Nieto commented
Like Laurissa pointed out, this feature is currently missing from Planner. Any update as to why it's missing/when it will be re-enabled? Thanks!