In the past I’ve set up a general ‘required’ textarea field … but I’ve then had to create an add-on that uses the entry saving hook to take the content of the field, adds it to a db table (with the member id, entry id, datetime, etc), and then wipes the content from the field (so it’s empty for next time, thus ‘required’ again).
Then I created a custom fieldtype that just displayed the results from the db table for that entry.
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