Jessica Leong was a Starfleet officer in the 24th century.
In 2371, she was a crewmember aboard the USS Voyager. She was among the crew stranded in the Delta Quadrant, when Voyager was forcefully brought there by the Caretaker.
In 2374, as an ensign, she was listed on a crew manifest. (VOY: "The Killing Game")
This character was only mentioned in writing.