mapping cosmos-nosql id to mongodb _id

I'm going to migrate my data from cosmos-nosql to mongodb .
the tool doesn't map the cosmos id field to mongodb _id field.
for example:
cosmos data:
```
 {  "id": "BSKT_1",
    "CustomerId": 111,
}
```
the mapped data in mongo
```
{
"_id": ObjectId("659f9bbcb128ee4f195bdf8d"),
"id" : "BSKT_1",
"CustomerId": 111
}
```

how can I resolve this issue?