This feature is now available in latest InDesign CC version. Please upgrade to the latest release.
Abhinav AgarwalLaura Sutherland commented
I'm trying to test this at home before we roll it out at work — according to the Cloud, I've upgraded to the latest InD CC version, but there is no "Import PDF Comments" menu item, nor is there a "PDF comments" window. Do I need to activate it in some way or is it not available because we use templates originally created in (much) earlier versions of InD (but updated through the years)? And is it correct that PDF comments already marked from previous versions of InD can't be imported? Thanks.