Issues displaying blog post author name and comment counts

Hi, Metabox.

I created a custom field for related posts via post advanced select but I having a problem showing the author's name and comment counts inside single blog post.

Want to display:
https://markuphero.com/share/dM0giAmjeFkEFdckpu2x

<?php
add_filter( 'rwmb_meta_boxes', 'your_prefix_function_name' );

function your_prefix_function_name( $meta_boxes ) {
    $prefix = '';

    $meta_boxes[] = [
        'title'  => __( 'Related Post', 'your-text-domain' ),
        'id'     => 'related-post',
        'fields' => [
            [
                'name'       => __( 'Post', 'your-text-domain' ),
                'id'         => $prefix . 'post_related',
                'type'       => 'post',
                'post_type'  => ['post'],
                'field_type' => 'select_advanced',
                'multiple'   => true,
            ],
        ],
    ];

    return $meta_boxes;
}

<div class="post-related">
{% for post in query.posts %}
	{% for item in post.post_related %}
		<div class="p2-post-related__card">
			<h2 class="p2-post-related__header">
				<h3 class="p2-post-related__category">{{ mb.get_the_term_list( item.ID, 'category', '', ', ' ) }}</h3>
				<a href="{{ item.url }}" class="p2-post-related__title">{{ item.title }}</a>
			</h2>
			<div class="p2-post-related__meta">
				<div class="p2-post-related_author_name">By <a href="#">Julia James</a></div> 
				<div class="p2-post-related_details"><span>{{ item.date | date( 'F j, Y' ) }}</span> · <span>6 comments</span></div>
			</div>
			<div>
				<img src="{{ item.thumbnail.full.url }}" width="{{ item.thumbnail.full.width }}" height="{{ item.thumbnail.full.height }}" alt="{{ item.thumbnail.full.alt }}" class="p2-post-related__thumbnail">
			</div>
		</div>
	{% endfor %}
{% endfor %}
</div>
<!-- post-related -->

Thank you.