This script updates Google Slides footers to display slide numbers and non-skipped slide counts in Persian numerals.

Code.gs

function updateSlideFootersWithNotSkippedCount() {
  // Get the active presentation
  var presentation = SlidesApp.getActivePresentation();
  
  // Get all the slides in the presentation
  var slides = presentation.getSlides();
  
  // Initialize a counter for not skipped slides
  var notSkippedCount = 0;
  
  // First pass: Count the non-skipped slides
  for (var i = 0; i < slides.length; i++) {
    var slide = slides[i];
    if (!slide.isSkipped()) {
      notSkippedCount++;
    }
  }
  
  // Second pass: Update each slide's footer with the non-skipped count
  for (var i = 0; i < slides.length; i++) {
    var slide = slides[i];
    
    // Assuming there is a placeholder for the footer
    var placeholders = slide.getPlaceholder(SlidesApp.PlaceholderType.SLIDE_NUMBER);

      // Convert numbers to Persian
      var persianSlideNumber = toPersianNumber(i + 1);
      var persianNotSkippedCount = toPersianNumber(notSkippedCount);
    
    if (placeholders) {
      var textRange = placeholders.asShape().getText();
      textRange.setText(`${persianSlideNumber}/${persianNotSkippedCount}`).getParagraphStyle().setTextDirection(SlidesApp.TextDirection.RIGHT_TO_LEFT);;
    }
  }
}

function onOpen() {
  // Add a custom menu to the Google Slides UI
  SlidesApp.getUi()
    .createMenu('Custom Tools')
    .addItem('Update Footers with Not Skipped Count', 'updateSlideFootersWithNotSkippedCount')
    .addToUi();
}

function toPersianNumber(number) {
  var persianDigits = ['۰', '۱', '۲', '۳', '۴', '۵', '۶', '۷', '۸', '۹'];
  return number.toString().replace(/\d/g, function(digit) {
    return persianDigits[parseInt(digit)];
  });
}