How to check if a PDF Page has no annotations like comments or Fill and Sign

Now I have a file  CheckAnnots.js with the following code in C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Javascripts

function CheckAnnots(doc, nPage)

{ 

doc.syncAnnotScan();  

var annots = doc.getAnnots({nPage: nPage});  

if (annots==null || annots.length==0) return false; 

else return true; 

} 

app.addMenuItem({cName: "check", cParent: "File", cExec: "CheckAnnots()"});

I hope this is correct?

My VBA Code is

Sub CheckPDFAnnotations()

Dim App As Acrobat.CAcroApp
Dim PDDoc As Acrobat.CAcroPDDoc
Dim i As Long
Dim jso As Object

Dim blnAnnotations As Boolean

Set App = CreateObject("AcroExch.App")
Set PDDoc = CreateObject("AcroExch.PDDoc")
PDDoc.Open ("C:\Users\Josua\Documents\Test01.pdf")

Set jso = PDDoc.GetJSObject

blnAnnotations = CheckAnnots(this, 0)

End Sub

But something must be wrong with Syntax   CheckAnnots(this,0)   ?

I think this is not correct or I Need   jso.CheckAnnots, too?