Want to restrict visibility a performance DFF field to manager using manage context and Read only

Summary:

When manager will do evaluation for worker we need a DFF, which will be visible only to manager.

How can we achieve this using Manage context or any idea?

Also we are using Redwood version performance document page.

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

24C

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