POST with more than one "body" - dart

Question

This is my code to make the call, a POST. Until now I only needed to send one product in each post.
But, I wanted to start sending my list of products in just one POST.
Future DadosPagamento() async {
await Future.delayed(const Duration(milliseconds: 200));
var headers = {'Authorization': 'Bearer Gns2DfakHnjd9id', 'Content-Type': 'application/json'};
var request = http.Request(
'POST', Uri.parse('http://appdnz.ddns/APP1/Products'));
request.body = json.encode(
[
{
"OrderState": "",
"LineID": "1",
"ClientID": idCliente,
"ProductReference": ref,
"Color": color,
"Size": size,
"Quantity": quantity,
"UnitPriceWithoutTax": precoSemTax,
"ShippingAmount": envioPreco,
"OrderReference": "",
"CarrierID": idTrans,
"Comments": comentario,
"ProductDescription": descricaoProd,
"ShippingName": envioNome,
},
],
);
request.headers.addAll(headers);
http.StreamedResponse response = await request.send();
if (response.statusCode == 200) {
print(await response.stream.bytesToString());
} else {
print(response.reasonPhrase);
}
}
example of what i want to send
request.body = json.encode(
[
{
"Lineid" = "1",
"Reference"= "xpto",
"Quantity"= "1"
....
}
,
{
"Lineid" = "2",
"Reference" = "xpto2",
"Quantity" = "5"
...
}
,
{
"Lineid" = "3",
"Reference" = "xpto3",
"Quantity" = "6"
...
}
]
)
In the research I did, I realized that it might work if I create a list and put it in json.encode(list), I don't know if it's the best way or if there aren't any more ways.
Thanks