archive-portfolio-featured.php

<?php

/**
 * Display blockquote from post 
 * @see https://www.billerickson.net/access-gutenberg-block-data/
 */
function be_display_post_blockquote() {
  global $post;
  $blocks = parse_blocks( $post->post_content );
  foreach( $blocks as $block ) {
    if( 'core/quote' === $block['blockName'] ) {
      echo render_block( $block );
      break;
    }
  }
}