```
{ 
    "_id" : ObjectId("6221f3a818880f14e3c33040"), 
    "__v" : 0, 
    "createdAt" : ISODate("2022-03-04T11:10:32.753Z"), 
    "pm" : { 
        "checkList" : [ 
            { 
                "ch_id" : "621eff4e0ed5c751adaa42fb", 
                "status" : "statu", 
                "dateMonthYear" : 1646286480139.0, 
                "val" : "Gopi", 
                "remarks" : "Good", 
                "_id" : ObjectId("6221f3a80a703519a4406e6c") 
            }, 
            { 
                "ch_id" : "621eff4e0ed5c751adaa42fb", 
                "status" : "status", 
                "dateMonthYear" : 1646286480139.0, 
                "val" : "Gopi", 
                "remarks" : "Good", 
                "_id" : ObjectId("6221f3a80a703519a4406e6e") 
            } 
        ] 
    }, 
    "updatedAt" : ISODate("2022-03-04T11:56:59.662Z") 
}

```

Above is the collection, and in that I need to update the checklist array inside `pm` object using "\_id" as a find condition.
For example I need to change `val` and `remarks` of \_id, `ObjectId("6221f3a80a703519a4406e6e")`.

How to achieve this?