Convert JSON to CSV, repeating parent value

There's a lot of discussion to convert JSON to CSV with jq, but can't find my situation.

2 points really blocking me :

1. Get key and value of valuePerDay by row
2. Sort valuePerDay keys to unsure values always in the same position

I assume this JSON give the valuePerDay always the same keys for each arr.

I have this JSON :

{"prop1": "val1","prop2": "val2","arr": [    {"arrProp1": "arr1Prop1","arrProp2": "arr1Prop2","valuePerDay": {"2024-01-01": 1,"2024-01-02": 2,"2024-01-03": 3      }    },    {"arrProp1": "arr2Prop1","arrProp2": "arr2Prop2","valuePerDay": {"2024-01-02": 22,"2024-01-01": 11,"2024-01-03": 33      }    },    {"arrProp1": "arr3Prop1","arrProp2": "arr3Prop1","valuePerDay": {"2024-01-03": 333,"2024-01-01": 111,"2024-01-02": 222      }    }  ]}

Here is my actual JQ, but values are multiply by keys

.prop1 as $prop1| .prop2 as $prop2| .arr[]  | .arrProp1 as $arrProp1  | .arrProp2 as $arrProp2  | .valuePerDay    | keys_unsorted[] as $key    | .[] as $value| [$prop1,$prop2,$arrProp1,$arrProp2,$key,$value] | @csv

Which give me :

"prop1","prop2","arrProp1","arrProp2","valuePerDay","value""val1","val2","arr1Prop1","arr1Prop2","2024-01-01",1"val1","val2","arr1Prop1","arr1Prop2","2024-01-01",2"val1","val2","arr1Prop1","arr1Prop2","2024-01-01",3"val1","val2","arr1Prop1","arr1Prop2","2024-01-02",1"val1","val2","arr1Prop1","arr1Prop2","2024-01-02",2"val1","val2","arr1Prop1","arr1Prop2","2024-01-02",3"val1","val2","arr1Prop1","arr1Prop2","2024-01-03",1"val1","val2","arr1Prop1","arr1Prop2","2024-01-03",2"val1","val2","arr1Prop1","arr1Prop2","2024-01-03",3"val1","val2","arr2Prop1","arr2Prop2","2024-01-01",11"val1","val2","arr2Prop1","arr2Prop2","2024-01-01",22"val1","val2","arr2Prop1","arr2Prop2","2024-01-01",33"val1","val2","arr2Prop1","arr2Prop2","2024-01-02",11"val1","val2","arr2Prop1","arr2Prop2","2024-01-02",22"val1","val2","arr2Prop1","arr2Prop2","2024-01-02",11"val1","val2","arr2Prop1","arr2Prop2","2024-01-03",33"val1","val2","arr2Prop1","arr2Prop2","2024-01-03",22"val1","val2","arr2Prop1","arr2Prop2","2024-01-03",33"val1","val2","arr3Prop1","arr3Prop2","2024-01-01",111"val1","val2","arr3Prop1","arr3Prop2","2024-01-01",222"val1","val2","arr3Prop1","arr3Prop2","2024-01-01",333"val1","val2","arr3Prop1","arr3Prop2","2024-01-02",111"val1","val2","arr3Prop1","arr3Prop2","2024-01-02",222"val1","val2","arr3Prop1","arr3Prop2","2024-01-02",333"val1","val2","arr3Prop1","arr3Prop2","2024-01-03",111"val1","val2","arr3Prop1","arr3Prop2","2024-01-03",222"val1","val2","arr3Prop1","arr3Prop2","2024-01-03",333

And I want :

"prop1","prop2","arrProp1","arrProp2","valuePerDay","value""val1","val2","arr1Prop1","arr1Prop2","2024-01-01",1"val1","val2","arr1Prop1","arr1Prop2","2024-01-02",2"val1","val2","arr1Prop1","arr1Prop2","2024-01-03",3"val1","val2","arr2Prop1","arr2Prop2","2024-01-01",11"val1","val2","arr2Prop1","arr2Prop2","2024-01-02",22"val1","val2","arr2Prop1","arr2Prop2","2024-01-03",33"val1","val2","arr3Prop1","arr3Prop2","2024-01-01",111"val1","val2","arr3Prop1","arr3Prop2","2024-01-02",222"val1","val2","arr3Prop1","arr3Prop2","2024-01-03",333