When creating a CSV profile, it says: You can use Template Toolkit tags too. See the help page for more information. But I didn't find any documentation in the Manual. It looks like the bug introducing this was bug 12404.
It looks like this got lost when we removed the old help pages in favor of links to the manual: https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=35052
*** Bug 27986 has been marked as a duplicate of this bug. ***