Gutenberg - make Button blocks open links in a new window

functions.php

<?php

//* Enqueue Script
add_action( 'wp_enqueue_scripts', 'yourtheme_enqueue_globaljs_script' );
function yourtheme_enqueue_globaljs_script() {
  
  wp_enqueue_script( 'global-js', get_stylesheet_directory_uri() . "/global.js", array( 'jquery' ), '1.0', true );

}

global.js

(function($) {
  'use strict';
  
  // In the Gutenberg editor, give your button block an Additional CSS Class of: target-blank

  // Make Gutenberg button blocks with a custom class open links in a new window
  $('.wp-block-button.target-blank > a').attr('target','_blank');

})(jQuery);