How to mail merge Word documents and convert to PDF in Azure Functions v2

using Syncfusion.Pdf;
using Syncfusion.DocIO.DLS;
using Syncfusion.DocIORenderer;
using Syncfusion.DocIO;

//JSON string
string jsonDataString = "{\"Reports\":[{\"SiteName\":\"Test Site Name\",\"SiteAddress\":\"Test Site Address\",\"ClientName\":\"Compliance 365\",\"Locations\":[{\"id\":\"1\",\"Name\":\"Location 1\",\"Description\":\"Test Description\"}]}]}";
//Gets JSON object from JSON string
JObject jsonObject = JObject.Parse(jsonDataString);
//Converts to IDictionary data from JSON object
IDictionary<string, object> data = GetData(jsonObject);
 
Stream stream = req.Content.ReadAsStreamAsync().Result;
//Opens the template document
WordDocument wordDocument = new WordDocument(stream, FormatType.Docx);
//Creates the mail merge data table in order to perform mail merge
MailMergeDataTable dataTable = new MailMergeDataTable("Reports", (List<object>)data["Reports"]);
//Performs the mail merge operation with the dynamic collection
wordDocument.MailMerge.ExecuteNestedGroup(dataTable);
//Create instance for DocIORenderer for Word to PDF conversion
DocIORenderer render = new DocIORenderer();
//Converts Word document to PDF.
PdfDocument pdfDocument = render.ConvertToPDF(wordDocument);
//Release the resources used by the Word document and DocIO Renderer objects
render.Dispose();
wordDocument.Dispose();
 
MemoryStream memoryStream = new MemoryStream();
//Saves the PDF file
pdfDocument.Save(memoryStream);
memoryStream.Position = 0;
//Create the response to return
HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
//Set the PDF document content response
response.Content = new ByteArrayContent(memoryStream.ToArray());
//Set the contentDisposition as attachment
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{    FileName = "Result.pdf"
};
//Set the content type as PDF format mime type
response.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
 
//Return the response with output PDF stream
return response;

//Reads the template Word document
FileStream fs = new FileStream(@"../../Data/Adventure.docx", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
fs.Position = 0;
//Saves the Word document in memory stream
MemoryStream inputStream = new MemoryStream();
fs.CopyTo(inputStream);
inputStream.Position = 0;
 
try
{
    Console.WriteLine("Please enter your Azure Functions URL :");
    string functionURL = Console.ReadLine();
 
    //Create HttpWebRequest with hosted azure function URL               
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(functionURL);
    //Set request method as POST
    req.Method = "POST";
    //Get the request stream to save the Word document stream
    Stream stream = req.GetRequestStream();
    //Write the Word document stream into request stream
    stream.Write(inputStream.ToArray(), 0, inputStream.ToArray().Length);
 
    //Gets the responce from the Azure Function
    HttpWebResponse res = (HttpWebResponse)req.GetResponse();
 
    //Saves the Word document stream
    FileStream fileStream = File.Create("Result.pdf");
    res.GetResponseStream().CopyTo(fileStream);
    //Dispose the streams
    inputStream.Dispose();
    fileStream.Dispose();
}
catch (Exception ex)
{
    throw;
}