[Flutter] How I can get specific value from HTTP method in FLUTTER?

My output is like this:

{
"scope": [],
"_id": "62413827f85e740dd8af749d",
"access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJpc3N1ZXIiLCJzdWIiOnsidXNlcklkIjoiNjI0MTM4MjdmODVlNzQwZGQ4YWY3NDlhIn0sImlhdCI6MTY0ODQ0MTM4M30.cNE32yojMlbohsOtgB2docCsZk8UPqEbPVTizV--rMs",
"user": {
"_id": "62413827f85e740dd8af749a",
"email": "ahmed@gmail.com",
"password": "hello",
"phone": "01723456789",
"createdAt": "2022-03-28T04:23:03.334Z",
"updatedAt": "2022-03-28T04:23:03.334Z",
"__v": 0
},
"createdAt": "2022-03-28T04:23:03.348Z",
"updatedAt": "2022-03-28T04:23:03.348Z",
"__v": 0
}


How can I get the value of "email" from "user" in flutter? I am using the following code.

http
.post(Uri.parse(url),
headers: {"Content-type": "application/json;charset=UTF-8"},
body: jsonEncode(model))
.then((value) {
var access = jsonDecode(value.body);

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