How to add a contact to a list in ActiveCampaign API v3

The v3 docs have been updated (Lists documentation) and they no longer read that you can add a contact to a list through the API. ActiveCampaign Lists documentation screenshot

EDIT: you can add a contact to a list using the v1 contact_sync (contact_sync documentation)

SECOND EDIT: you can now add a contact to a list and/or change their subscription status to a given list through the v3 API! (update list status for a contact documentation)