Gutenberg on an ACF options page

Create a page named as your archive, add blocks there. In archive-name.php please add:

<?php get_header();

$page_id   = get_post( 57 );
$page =  apply_filters( 'the_content', $page->post_content );

echo $page; ?>

<?php get_footer();

Replace ’57’ with your page ID. Now you can manage content of archive page directly from Pages.