How to capture 'Operation Reason' before unchecking ‘edsvaUserMustChangePasswordAtNextLogon’ option from ARS Web interface

I am looking to enable a text field prompt in order to capture the 'reason' whenever helpdesk folks unchecks the ‘edsvaUserMustChangePasswordAtNextLogon’ option for a user from ARS Web interface.

I found

Appreciate any pointers in getting started or with a script in achieving this.  Thanks.