Even if you could add canonical link into the header, you cannot have canonical link represent content on another domain. So no, there is nothing do be done in this regard(even if anchor itself would support rel=canonical).
I would just add link to the top of the text pointing to the new location with a note and leave it be.
Even if you could add canonical link into the header, you cannot have canonical link represent content on another domain. So no, there is nothing do be done in this regard(even if anchor itself would support rel=canonical).
I would just add link to the top of the text pointing to the new location with a note and leave it be.