Send JSON Array on Body -> form-data

Hello there,

I want to post data on the form-data in Body to the that api which structure in below but i cannot send truly.

Can you help me to the send this array?

{
"Format": [string],
    "Orders":
    [{
    "Order": {
    "ClientOrderId":[int],
    "TotalOrderAmount":[decimal],
    "OrderShipment" {
        "PersonName":[string],
        "OtherPersonName":[string],
        "StreetAddress":[string],
    },
    "OrderInvoiceAddress": {
        "CustomerName":[string],
        "TaxOffice":[string],
        "TaxNumber":[string],
    },
    "OrderLines":
        [{
        "OrderLine": {
            "Ian":[string],
            "Quantity":[int],
        }
    }]
    }
}]
}

This is structure.
I tried this key on data but didn’t work. =>

Orders[Order][ClientOrderId]