Get child pages in ACF block

some-block.php

<?php

$args  = array(
    'post_type'        => 'any',
    'post_status'      => 'publish',
    'posts_per_page'   => - 1,
    'post_parent'      => $post_id, // Available in ACF blocks by default
    'order'            => 'ASC',
    'orderby'          => 'menu_order',
    'suppress_filters' => false,
);
$posts = get_posts( $args );

if ( ! $posts ) {
	return false;
}
global $post;
?>

<div class="some-block">
    <div class="row justify-content-center">
		<?php foreach ( $posts as $post ) : setup_postdata( $post ); ?>
			<?php get_template_part( 'some-template' ); ?>
		<?php endforeach; ?>
		<?php wp_reset_postdata(); ?>
    </div>
</div>