Unfortunately, no, as the trailing information is handled by Word’s field which doesn’t allow formating. The only way would be to possibly change that alternative Author (Year) option , to remove closing parenthesis and then you can type your own additional info and format it as you like.
so citation would look like this
Author|, (Year| Cited Pages|,
which unformated would look like {Author, year} but come out as Lidell (1940 and you would manually add the text before a manually inserted closing parenthesis with the formating you want. – Of course if you use a lot of conventional Author (Year) cites, you would need to manually add the closing parenthesis to all of them.
… see {Liddell, 1940 #1234@823`, s.v._ἄριστος_@author-year} …