If you’re moving from any LMS to Moodle one of the challenges is converting any existing materials you have to usable formats for your new LMS. You can use a third party to do the work for you, or you can work with the content yourself extending Moodle’s capabilities to import question types from other systems.
This question format extension for Moodle lets you import questions from Canvas by Instructure using their XML file export. The addon was created by Jean-Michel Vedrine and is available here: https://moodle.org/plugins/view.php?plugin=qformat_canvas.
Once installed it will give you the option to select Canvas when importing questions into your item banks.