Inserting pages in between the words of one citation is not possible.

This is another thing that is controled by the Endnote output style.  In the Bluebook - Law Review, I downloaded from endnote’s online style collection - it appears that the “cited pages” field is there, and you can edit the footnote to include this text via the “edit citation” tool - where you right click in the footnote itself, choose “edit citation” and put your cited pages in the 3rd box.  – however, the style itself appears to vary in the position at which it inserts this information.  Have you tried this output style?  I attach it here (I dated it so I knew when I downloaded it).  To use it, you need to open it (and it should open in endnote) and then save as (and remove the word copy).  Then you need to go into word and find the endnote tools to specify this specific version of the file.  You will need to “select another style” to find this newly saved version.  see image.  

Bluebook-Law Review Nov2017.ens (39.1 KB)