Possible meta-informations in R/exams

I discover the very useful R/exams package, as well as its very complete documentation. Unless I'm mistaken, I didn't find a place providing an exhaustive list of meta-informations that can be included at the end of a Rmd question. I'm particularly interested in the meta-informations in the context of a moodle export. I know that it is possible to define a section or a sub-section, or to request the upload of a document, for example. But what are all the other possibilities? Thank you very much!