I have not seen an option to create flashcards natively in Canvas. The functionality may exist through code if your institution has opened up the ability to mess with some advanced features (many do not unlock those features). You are otherwise looking at 3rd-party tools.
If you go to your course Settings and find the Apps tab (if that is available for you), search for the word "flash" to find something called Flash Reference. This does add the ability to create flashcards for use, but I'm not sure it will interact with QLearn. I do not see an app for QLearn, which would make sense since QLearn appears to be another LMS like Canvas.
If you are needing something that works with QLearn, you will probably want to look through their documentation and resources to see if there is a flashcard tool that would work for their interface.