@opus Fidus Writer now has an export filter that is much better than that Java project from 2016. I believe the import filter through paste is also better, but I don’t remember all the details of that project. As far as I can recall, he used a pre-existing framework to parse and write docx, which meant that he could not add anything that this framework didn’t support. So that meant only support for a specific very limited form of citations which is what Word supports natively.
The project is written in Java, which is a different language than what is used in Fidus Writer and it has made it hard for us to maintain after the student who wrote that was done with his project. I don’t think it currently works, but if it can do anything that we currently cannot do, it should not be too difficult to update it.