How to use a WordPress Block in a custom page template

snippet.php

// Source block markup can be retrieved from the posts table in the database after you configure a block on a page
$your_block = '<!-- wp:heading {"level":1} -->
<h1>Heading 1</h1>
<!-- /wp:heading -->';

$parsed_blocks = parse_blocks( your_block );

if ( $parsed_blocks ) {
	foreach ( $parsed_blocks as $block ) {
    echo render_block( $block );
    //echo apply_filters( 'the_content', render_block( $block ) );
	}
}