[{priceRange:[[1600732800000,5.28424438726287],[1600819200000,5.08434522342211],[1600905600000,3.491229168216385],[1600992000000,4.573890580327729],[1601078400000,4.702973876095848]]}]

db.collection.aggregate([{"$project":{"isBigger":{"$cond":{"if":{"$gt":[{"$last":{"$first":"$priceRange"}},{"$last":{"$last":"$priceRange"}}]},"then":true,"else":false}}}}])