get image url ckfinder

Question

I want to take the image address and add it to data-original="image url"

Sample : <img src="Bengal-kedisi.jpg" data-original="Bengal-kedisi.jpg"  class="lazy w-100 ortalaimg">

  on: {
    instanceReady: function() {
      this.dataProcessor.htmlFilter.addRules( {
        elements: {
          img: function( el ) {
            if ( !el.attributes["data-original"])
              el.attributes["data-original"]= 'images URL';
            el.addClass( 'lazy w-100 ortalaimg' );

          }
        }
      } );
    }
  }