FAFSA/NPC question about shares in private company

How does one report shares in a private company on FAFSA or an NPC? I understand that dividends, etc would be reported as income, but what about the value of the actual shares? There are restrictions on selling them, so it isn’t like we could just sell them like shares in a public company. Basically could only go back to company.

Where can I find an answer to this - my google skills are failing me!