I have been trying for quite some time, but have not had any luck. I have on question and one question only.
Is it possible to add managed metadata to people within the Person or Group column?
No, we could not add managed metadata to the Person or Group column.
As referred before, we could only associate the profile property with a managed metadata term set in User profile service application.
For more information, please refer to:
You can add your own properties to user profiles: