I don't believe this is in the docs ATM.
As it just came up in discussions around the new org-mode citation support, it strikes me we should.
https://lists.gnu.org/archive/html/emacs-orgmode/2021-04/msg00497.html
Also, see this issue over at pandoc, which I think suggests this should be configurable?
jgm/pandoc-citeproc#256
@fbennett @bwiernik @denismaier @jgm