How to get values from a Subform when use ZDK.Apps.CRM.Sales_Orders.fetchById ( Deluge Client Script)

How to get values from a Subform when use ZDK.Apps.CRM.Sales_Orders.fetchById ( Deluge Client Script)

Hi Folks,
I´m working with two modules Sales Orders and Cases, and I´m needing get from Cases Form the values recorded in the  field product_description located in a subform Product_Details  in Sales Order module to do a comparation .

I´m using  this piece of code to reffer to Sales Order ID and I can access the record, but I need ideas to get the info 

// Get ID de la Orden de Venta Asociada 
var soid = ZDK.Page.getField("Orden_de_Venta_Asociada").getValue();
// Get records from Sales Order ID (soid)
var sales_order = ZDK.Apps.CRM.Sales_Orders.fetchById(soid.id); 



This is the JSON with the data registered in the Sales Order record that I´m using to to the tests.

JSON.stringify with null, 4: {
    "_Owner_Lookup_Id": "6049481000000443001",
    "_Deal_Name_Lookup_Id": "6049481000000863046",
    "_Quote_Name_Lookup_Id": "6049481000000886164",
    "_Contact_Name_Lookup_Id": null,
    "_Account_Name_Lookup_Id": null,
    "_Created_By_Lookup_Id": null,
    "_Modified_By_Lookup_Id": null,
    "_keyModified": {},
    "_$line_tax": [],
    "_Owner": null,
    "_SO_Number": "6049481000000908007",
    "_Subject": "Pedido",
    "_Deal_Name": null,
    "_Customer_No": null,
    "_Purchase_Order": null,
    "_Quote_Name": null,
    "_Due_Date": "2024-01-02",
    "_Pending": null,
    "_Contact_Name": {
        "name": "jhon Doe",
        "id": "6049481000000559052"
    },
    "_Carrier": "FedEX",
    "_Status": "Aprobado",
    "_Account_Name": {
        "name": "Su empresa",
        "id": "6049481000000559049"
    },
    "_Created_By": {
        "name": "Pedro Perez",
        "id": "6049481000000443001",
        "email": "pedro@sp.net"
    },
    "_Proforma": null,
    "_Modified_By": {
        "name": "Jhon Doe",
        "id": "6049481000000443001",
        "email": "pedro@sp.net"
    },
    "_Factura_P_F": null,
    "_Tag": [],
    "_Locked__s": false,
    "_Billing_Street": "A",
    "_Shipping_Street": null,
    "_Billing_City": "B",
    "_Shipping_City": null,
    "_Billing_State": "C",
    "_Shipping_State": null,
    "_Billing_Code": "D",
    "_Shipping_Code": null,
    "_Billing_Country": null,
    "_Shipping_Country": null,
    "_Product_Details": [
        {
            "_product_Lookup_Id": "6049481000000664005",
            "_keyModified": {},
            "_$line_tax": null,
            "_product": null,
            "_quantity": 10,
            "_Discount": 0.32,
            "_total_after_discount": 31.68,
            "_net_total": 31.68,
            "_book": null,
            "_Tax": 0,
            "_list_price": 3.2,
            "_unit_price": 3.5,
            "_quantity_in_stock": 0,
            "_total": 32,
            "_product_description": null
        },
        {
            "_product_Lookup_Id": "6049481000000666071",
            "_keyModified": {},
            "_$line_tax": null,
            "_product": null,
            "_quantity": 15,
            "_Discount": 0,
            "_total_after_discount": 52.5,
            "_net_total": 52.5,
            "_book": null,
            "_Tax": 0,
            "_list_price": 3.5,
            "_unit_price": 0,
            "_quantity_in_stock": 0,
            "_total": 52.5,
            "_product_description": null
        }

Thanks
Fabian