[{"_id":ObjectId("5e19d76fa45abb5d4d50c1d3"),"name":"Leonel Messi","country":"Argentina","awards":[{"award":"Ballon d'Or","year":1972},{"award":"Golden Boot","year":1971},{"award":"FIFA World Player of the Year","year":1988}]},{"_id":ObjectId("53f9d76fa45abb5d4d30c112"),"name":"Lars Sørensen","country":"Denmark","awards":[{"award":"Ballon d'Or","year":1971},]}]

db.collection.aggregate([{"$project":{"name":"$name","won_golden_boot":{"$cond":{"if":{"$in":["Golden Boot","$awards.award"]},"then":true,"else":false}}}}])