I think this is answered here: https://community.atlassian.com/t5/Trello-questions/Unique-share-of-a-card/qaq-p/774957
Short version, no, not really, though you can possibly copy that card to a public board, or a board where that person is a member.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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