flutter access json object inside object

1myJson = {
2  "label": "This is a string",
3  "value": {
4  	"address": "This is a string",
5    "country": "This is a string"
6  }
7}
8
9//to access address field
10var decodedJson = json.decode(myJson);
11var jsonValue = json.decode(decodedJson['value']);
12print(jsonValue['address']);