Objeto JSON de acesso à frigideira dentro do objeto
myJson = {
"label": "This is a string",
"value": {
"address": "This is a string",
"country": "This is a string"
}
}
//to access address field
var decodedJson = json.decode(myJson);
var jsonValue = json.decode(decodedJson['value']);
print(jsonValue['address']);
SeriousMonk