According to the output style notes, “The Blue Book Style is a footnote style.” There is nothing in the “citation template”. It also says: “This style is based on the format found in The Blue Book, A Uniform System of Citation 17th Edition published by the Columbia Law Review Association, the Harvard Law Association, The University of Pennsylvania Law Review and the Yale Law Journal.”
This means you need to put in a footnote using Word, and put your citation into the footnote. Is that no longer the case? (snigger)