[{"_id":"61144a393c532f066725bd24","classification":"Feliz","probability":0.98,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-11T22:07:53.331Z"),"updatedAt":"2021-08-11T22:07:53.331Z","__v":0},{"_id":"61144a46d30bd006fa2be702","classification":"Feliz","probability":0.98,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-11T22:08:06.618Z"),"updatedAt":"2021-08-11T22:08:06.618Z","__v":0},{"_id":"611541dd62a7f214afab3ceb","classification":"Triste","probability":0.9,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-12T15:44:29.150Z"),"updatedAt":"2021-08-12T15:44:29.150Z","__v":0},{"_id":"611541f762a7f214afab3cf5","classification":"Raiva","probability":0.86,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-12T15:44:55.909Z"),"updatedAt":"2021-08-12T15:44:55.909Z","__v":0},{"_id":"6115420362a7f214afab3cf7","classification":"Neutro","probability":0.99,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-12T15:45:07.297Z"),"updatedAt":"2021-08-12T15:45:07.297Z","__v":0},{"_id":"6115420462a7f214afab3cf9","classification":"Neutro","probability":0.99,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-12T15:45:08.002Z"),"updatedAt":"2021-08-12T15:45:08.002Z","__v":0},{"_id":"611543d252be9a187c380e5d","classification":"Feliz","probability":0.91,"user":"60eecfeba0810013e750cdbc","createdAt":ISODate("2021-08-12T15:52:50.599Z"),"updatedAt":"2021-08-12T15:52:50.599Z","__v":0}]

db.collection.aggregate([{$group:{_id:{createdAt:{$dateToString:{format:"%d/%m/%Y",date:"$createdAt"}},classification:"$classification"},count:{$sum:1}}},{$group:{_id:"$_id.createdAt",classifications:{$push:{k:"$_id.classification",v:"$count"}}}},{$addFields:{classifications:{$arrayToObject:"$classifications"}}}])