How to check ischanged property of a field using EL expression in page composer

Summary:

Im trying to remove field value from grade step, when grade ID value is changed using page composer.

I'm trying to identify changed property of Grade ID, please suggest appropriate EL expression:

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

23C

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

#{bindings.GradeId.isChanged eq true ? null : 'Step1'}