Make Primary Work Location, Department as Read only while creating Job requisition

Summary:

Our requirement is to make the following fields under offer info as read only when creating a job requisition:

1. Primary Work Location
2. Department
3. Grade

Using page composer, I am unable to find the read only option.

Content (please ensure you mask any confidential information):

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

24A - Responsive UI

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