I discovered it this week and I love it! Not sure how new the feature is.
It’s easy. Just put the citation inside square brackets, and then preface all that with a caret. Like this: Beanis cures cancer.^[I made it up.]
It automatically takes care of the numbering and shit.
Example:
Beanis cures cancer,[1] and aliens will arrive next year.[2] More and more people are saying these things![3]
Thank you!