The original one isn't really working at all, so this is a slightly modified version that
can be used.

I tested with pandoc 2.8.0, 2.19.2 and 3.1.8, only 2.19.2 worked correctly.

Bear in mind that I have no license over anything here.

Pandoc: https://pandoc.org/

ABNT style: https://github.com/bcdavasconcelos/CSL-ABNT-para-Autores-Antigos/blob/main/Pandoc/ABNT-FA.csl

ABNTEX-O-MATIC: https://github.com/bcdavasconcelos/ABNTeX-o-matic