How do I create textbox dynamically in jxa?

Question

New at javascript, trying to create a dynamic textbox in pages but it keeps getting an error.

var app = Application('Pages');
var doc = app.document;
var pages = doc.pages;

var newTextbox = pages[0].make({
    new:'textItem', at: pages[0], withProperties: {position:{"x":0, "y":0}, objectText:"sample text", height:20, width:20}
  });

error log Error -1700: Can't convert types.

here's is the equivalent in AppleScript

set thisStory to "sample test"

tell application "Pages"
    activate
    tell the front document
        tell current page
            set thisTextItem to ¬
                make new text item with properties ¬
                    {height:240, width:240, position:{0, 0}}
            set object text of thisTextItem to thisStory
        end tell
    end tell
end tell