Database
[{"_id":ObjectId("5f797a8f03b66b73edd4f56f"),"totalCounts":2300,"roadId":"road_2","type":"CALL","date":ISODate("2020-01-11T00:00:00.000Z"),"counts":{"GOOD":0.652173913043478,"BAD":0.347826086956522}}]
Query
db.collection.aggregate([{$set:{counts:{$objectToArray:"$counts"}}},{$unwind:"$counts"},{$set:{state:"$counts.k",rank:"$counts.v"}},{$project:{counts:0}}])