I Found a Sort of trick For my requirement of exporting multipage PDF using .HTML() method, U can use nested callback functions like these & give X, and Y Coordinates based on Page Size

   const doc = new jsPDF("p", "pt", "a4");   
   doc.html(document.getElementById("Page1"), {
      callback: function (pdf) {
        pdf.addPage("a4", "l");
        pdf.html(document.getElementById("Page2"), {
          callback: function (pdf2) {
            pdf2.addPage("a4", "l");
            pdf2.html(document.getElementById("Page3"), {
              callback: function (pdf3) {
                pdf3.save("multipage.pdf")
              },
              x: 0,
              y: 2 * pageHeight,
            });
          },
          x: 0,
          y: pageHeight,
        });
      },
      x: 0,
      y: 0,
    });

Any Suggestions on How to make these code dynamic using for loop, based on number of Pages?

Referencing this answer (refrencing)

Just use await and make sure to return doc inside the callback

something like this

var doc = new jspdf.jsPDF({
  orientation: 'p',
  unit: 'pt',
  format: 'letter'
});


var field = "<b>html test </b>";
doc.text(10, 10, "test");
//add first html
await doc.html(field, {
  callback: function (doc) {
    return doc;
  },
  width: 210,
  windowWidth: 210, 
      html2canvas: {
          backgroundColor: 'lightyellow',
          width: 210, 
          height: 150
      },
      backgroundColor: 'lightblue', 
  x: 10,
  y: 50,
  autoPaging: 'text'
});
window.open(doc.output('bloburl'));

now you can call doc.html as many times as you want for that same document

Originally posted by @bakuur in https://github.com/parallax/jsPDF/issues/3074#issuecomment-1328427528