How to disable "Candidate in plans" on the "Succession organization chart" for Line Managers

Summary:

We have the requirement to "Candidate in plans" on the "Succession organization chart" for Line Managers only, the customer want this in order to protect confidentiality in succession plans. The goal is to ensure that the Line Manager cannot see that someone is a candidate in another person's succession plan (public plans).

Content (required):

We have the requirement to "Candidate in plans" on the "Succession organization chart" for Line Managers only, the customer want this in order to protect confidentiality in succession plans. The goal is to ensure that the Line Manager cannot see that someone is a candidate in another person's succession plan (public plans).