Performance Management - Manager Evaluation of Worker - Auto populate Calculated Rating in Manager R

Summary

Auto-populate Calculated Rating in Manager Rating field

Content

Background: Manager Evaluation of Worker.  Manager have a tendency of entering a rating which is different from calculated rating in Manager Rating field. 

My client would like to stop the behaviour, by ensuring that manager calculated rating score is exactly the same as the score in Manager Rating Field.  Question?? is it possible to auto-populate manager calculated rating in Manager rating via Page Composer? Then , as per standard functionality the manager rating will populate Overall Summary.

Please see attached screen shot.