Calling number of images in image-caption-formatter.html.twig

Hi ,

below of this code will might help you for this kind scenario,
You can create a preprocess function specifically for the image-caption formatter and pass the count of images as a variable to the Twig template. Here's how you can do it:

use Drupal\Core\Field\FieldItemListInterface;
/**
 * Implements hook_preprocess_HOOK() for image_caption_formatter.
 */
function themeName_preprocess_image_caption_formatter(&$variables) {
  // Get the field items from the variables array.
  $items = $variables['items'];
  // Initialize a counter for the number of images.
  $imageCount = 0;
  // Loop through the field items to count the number of images.
  foreach ($items as $item) {
    if ($item instanceof FieldItemListInterface) {
      foreach ($item as $imageItem) {
        // Check if the item is an image.
        if ($imageItem->entity instanceof \Drupal\file\Entity\File) {
          $imageCount++;
        }
      }
    }
  }
  // Pass the image count variable to the template.
  $variables['image_count'] = $imageCount;
}

you can use the image_count variable to determine which code variant to render:

{% if image_count > 1 %}
  {# Variant 1 code #}
{% elseif image_count == 1 %}
  {# Variant 2 code #}
{% endif %}