Hello @joannal_lau ...
There's nothing that I'm aware of on the front-end of Canvas that would allow you to import comments in this way. However, I am going to share your question with the Canvas Developers group here in the Canvas Community in hopes that your question will get some additional exposure. If you are not following this group, please use the link that I have provided and then click on the "Follow" button at the top right corner of the screen. Also, there's a link for "Actions" near that "Follow" button. Click on "Actions", and then choose "Join group". I hope all of this will be of help to you! Good luck!
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