laravel api to flutter array

my json response is
{
"success": true,
"message": "Амжилттай",
"data": {
"July 2022": 319,
"August 2022": 531,
"September 2022": 478,
"October 2022": 235
}
}
But i need


final List<_SalesData> datass = [
_SalesData('July 2022', 319),
_SalesData('August 2022', 531),

];

What should i do