How to display to a report chart in the Approval notification page

Summary:

Hi

There is a requirement to show the bell curve to the managers ( Approvers) of their subordinates in the performance document approval notification.

Content (required):

Normally the bell curve is showing for the approved PDs, For this requirement, we need to include the all the completed and In process PDs in the bell curve.

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Code Snippet (add any code snippets that support your topic, if applicable):