Make collaboration possible on Notes Merged

It would be great to have collaboration possible on product notes just as it is possible in MS Word or Google docs. We are using product notes to do opportunity evaluation before the opportunity can be an initiative. We have multiple reviewers who comment on this analysis. Right now we have t do that in Google docs and then copy it as a note in Aha! We cant just link the Google doc in the note because when we publish the note as a notebook, other users cannot click on the link to access the document. This is inefficient and it would be great to include collaboration in the note. The other workaround can be to let notebook users to access the google doc link and to use Google as the Identity management system.