No, this is not possible. The Channels Autopost feature from JFBConnect is to post your article to the FB page/group, not the social widgets for that article.
I would suggest you attempt to use the Comment Mirroring feature of the Facebook Comments widget. With this any comments made on the Comments box can be mirrored to your FB page. You can read more about it
here
and scroll down to "Comment Mirroring". Any configuration for this is done on the Facebook page side and not within JFBConnect.
-Melissa