Change PDF Annotation font size using itext 7 - pdf

Question

My question is a bit similar to this one : Change PDF Annotation properties using iTextSharp C#
But I want to specifically change font size of pdf annotation using iText 7. I have searched a lot online but haven't been able to find any great examples or documentation regarding this. Following is the code I have used.
static void EditAnnot(string PDF)
{
string OutPDF = #"C:\Users\AP037X\Desktop\test.pdf";
iText.Kernel.Pdf.PdfDocument pdfDoc = new iText.Kernel.Pdf.PdfDocument(new iText.Kernel.Pdf.PdfReader(PDF), new iText.Kernel.Pdf.PdfWriter(OutPDF));
iText.Kernel.Pdf.PdfDictionary pageDict = pdfDoc.GetPage(1).GetPdfObject();
iText.Kernel.Pdf.PdfArray annots = pageDict.GetAsArray(iText.Kernel.Pdf.PdfName.Annots);
if (annots != null)
{
for (int i = 0; i < annots.Size(); i++)
{
Console.WriteLine("Scan..");
if (annots.GetAsDictionary(i) == null)
{
Console.WriteLine("1");
//return;
}
iText.Kernel.Pdf.PdfString t = annots.GetAsDictionary(i).GetAsString(iText.Kernel.Pdf.PdfName.Contents);
if (t == null)
{
Console.WriteLine("2");
//return;
}
Console.WriteLine(t);
if (Convert.ToString(t).Trim() == "Change")
{
Console.WriteLine("Found");
Console.WriteLine(annots.Size());
iText.Kernel.Geom.Rectangle rect = annots.GetAsDictionary(i).GetAsRectangle(iText.Kernel.Pdf.PdfName.Rect);
iText.Kernel.Pdf.PdfString cont = new iText.Kernel.Pdf.PdfString("New String");
iText.Kernel.Pdf.Annot.PdfFreeTextAnnotation NewAnnot = new iText.Kernel.Pdf.Annot.PdfFreeTextAnnotation(rect,cont);
float[] color = { 1f,1f,0f};
NewAnnot.SetColor(color);
NewAnnot.Put(iText.Kernel.Pdf.PdfName.Contents, new iText.Kernel.Pdf.PdfString("lion"));
NewAnnot.Put(iText.Kernel.Pdf.PdfName.Font, *What to type here?*);
annots.Remove(i);
annots.Add(i, NewAnnot.GetPdfObject());
}
}
}
pdfDoc.Close();
CompressPDF(OutPDF);
}