Good afternoon, @JaysonHart ...
This is a popular request from Canvas users. Unfortunately, I don't believe this currently exists in Canvas. However, check out the Feature Idea Ability to Save and Copy from Frequently Used Comm... - Canvas Community. If you feel that this Feature Idea aligns with something that you would like to see implemented in Canvas, you can give it a star rating as well as provide a comment (maybe paste in your paragraph above) to let Canvas engineers know why this would be important to you.
For the time being, you may just have to create a spreadsheet or Word document that contains your frequently used/canned comments, and then do a bit of copying/pasting to Canvas.
I know this might not be the answer you were looking for, but I hope it has helped to answer your question. Take care...be well.
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