Add a hyper link icon to subheadings in WordPress using .wp-block-heading class

gistfile1.txt

jQuery.noConflict();
jQuery('.wp-block-heading').each(function() {
    if (this.id) {
        var button = jQuery('<div><button><img draggable="false" role="img" class="emoji" alt="????" src="https://s.w.org/images/core/emoji/14.0.0/svg/1f517.svg"></button></div>');
        button.css({
            'position': 'absolute',
            'left': '-2rem'
        });
        button.find('button').css({
            'background': 'none',
            'border': 'none',
			'font-size': '1rem'
        });
        jQuery(this).css('position', 'relative');
        button.on('click', function() {
            var temp = jQuery("<input>");
            jQuery("body").append(temp);
            temp.val(window.location.href.split('#')[0] + '#' + this.id).select();
            document.execCommand("copy");
            temp.remove();
            jQuery(this).attr('title', 'Link copied!');
        }.bind(this));
        button.on('mouseout', function() {
            jQuery(this).attr('title', 'Copy link to this section: ' + jQuery(this).text());
        }.bind(this));
        jQuery(this).attr('title', 'Copy link to this section: ' + jQuery(this).text());
        jQuery(this).prepend(button);
    }
});

This only works if your theme uses the ".wp-block-heading" class