The potential of inking is huge, not just in the hands of students but for teachers and marking.
Canvas has just released DOCViewer in Beta. As yet it is not possible to annotate work inline using the stylus (at least on my Surface Pro).
We would love to see inking/hand-written/stylus based annotations being available for those using Canvas via the browser.
This idea has been added to our product plan for Q1 2019 and will influence development within Canvas. Follow this idea to receive updates as they are available.
:smileyinfo: Adding this idea to our product plan means we will be working on it, but it does not guarantee that it will be developed exactly as defined by the idea, or that it will be added to the production environment.