ACF block.json script example

block.js

(function($){

     // front end render on first instance of block only
     $(document).ready(function(){
          $('.block-faq').each(function(){
               faqBlockInit();
               return false;
          });
     });

     // back end trigger
     if( window.acf ) {
          window.acf.addAction( 'render_block_preview/type=wd/acf-faq', acfFaqBlockInit );
     }

     // set inital block counter
     let blockCountFaq = 0;

     // back end render for first instance of block only
     function acfFaqBlockInit(block) {
          blockCountFaq++
          if (blockCountFaq > 1) return;
          faqBlockInit();
     }

     // the jQuery
     function faqBlockInit() {

          $('.block-faq__toggle-question').on( 'click', function() {
               $(this).children('.block-faq__toggle-question-icons').attr('aria-selected', function (i, attr) {
                    return attr == 'true' ? 'false' : 'true'
               });
               $(this).children('.block-faq__toggle-question-icons').attr('aria-expanded', function (i, attr) {
                    return attr == 'true' ? 'false' : 'true'
               });
               $(this).siblings('.block-faq__toggle-answer').slideToggle().attr('aria-expanded', function (i, attr) {
                    return attr == 'true' ? 'false' : 'true'
               });
          });
     }

})(jQuery);