Formala for Eligibility in WFC plan

Summary:

What are the formula can be used in eligibility profile

Content (required):

In workforce compensation plan, we have eligibility to restrict population. However, based on that we have wrote on custom formal which type is "Compensation Person Selection" but this is not appearing at formula field under eligibility.

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

21d

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