Database
[{"titulo":"1",likes:["5e7ffb641650a326dcc1e1c7","5e7ffb641650a326dcc1e1c6"]},{"titulo":"2",likes:["123","456"]},{"titulo":"3",likes:["1","5e7ffb641650a326dcc1e1c6"]},{"titulo":"4",likes:["5e7ffb641650a326dcc1e1c8","2"]},{"titulo":"4",likes:["5e7ffb641650a326dcc1e1c7"]},{"titulo":"4",likes:[]}]
Query
db.collection.aggregate([{$addFields:{elementExists:{$cond:[{$in:["5e7ffb641650a326dcc1e1c7","$likes"]},true,false]}}},{$sort:{_id:-1}}])