Creating post template for a Custom Post Type

I have a custom post type called ‘abstract’ which contains the following meta_input array items

 $  abstract_details = array(  'post_title' => $  result->title, meta_input' => array(                 'abstract_id' => $  result->abstract_id,                 'title' => $  result->title,                 'author' => $  result->author,                 'writeup' => $  result->writeup,                 'ref' => $  result->ref,             ),             'post_type'   => 'abstract',             'post_status' => 'publish',         ); 

I want to display the contents of these items into their respective post, using something similar to below

<li style="list-style-type: none; text-align: justify;"><?php echo nl2br(esc_html(get_post_meta(get_the_ID(), 'writeup', true))) ?></li>                     <br>                     <?php $  isAvailRef = get_post_meta(get_the_ID(), 'ref', true)?>                     <?php $  refTag = "References/Bibliography: "?>                     <li style="list-style-type: none;"><b><?php if(!empty($  isAvailRef)): echo $  refTag; endif;?></b></li>                     <li style="list-style-type: none;"><?php echo nl2br(esc_html($  isAvailRef))?></li>                     <br>                     <li style="list-style-type: none;"><b>Student: </b><?php echo esc_html(get_post_meta(get_the_ID(), 'author', true)) ?></li> 

I’m quite new to WordPress (and quite frankly coding in general) and am stuck on where to actually include the above to only be found within the contents of the post. I’ve seen some tutorials suggesting to create a content-abstract.php file and add the details in there, but doing so would also add the entire post into the excerpt area of the post.

So the question is, where do you include the HTML code to display the details of the CPT, as seen below: enter image description here

Without also having to show this content in the excerpt? (like below)

enter image description here

In case it’s of any benefit, here are the contents of the default content.php file of the theme I am using

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?> <?php engage_mag_do_microdata('article'); ?>>     <?php     global $  engage_mag_theme_options;     $  engage_mag_show_image = 1;     if(is_singular()) {         $  engage_mag_show_image = $  engage_mag_theme_options['engage-mag-single-page-featured-image'];     }     $  engage_mag_show_content = $  engage_mag_theme_options['engage-mag-content-show-from'];     $  engage_mag_thumbnail = (has_post_thumbnail() && ($  engage_mag_show_image == 1)) ? 'engage-mag-has-thumbnail' : 'engage-mag-no-thumbnail';     ?>     <div class="engage-mag-content-container <?php echo $  engage_mag_thumbnail; ?>">         <?php         if ($  engage_mag_thumbnail == 'engage-mag-has-thumbnail'):             ?>             <div class="post-thumb">                 <?php                 engage_mag_post_formats(get_the_ID());                 engage_mag_post_thumbnail();                 ?>             </div>         <?php         endif;         ?>         <div class="engage-mag-content-area">             <header class="entry-header">                  <div class="post-meta">                     <?php                     engage_mag_list_category(get_the_ID());                     ?>                 </div>                 <?php                  if (is_singular()) :                     the_title('<h1 class="entry-title" ' . engage_mag_get_microdata("heading") . '>', '</h1>');                 else :                     the_title('<h2 class="entry-title" ' . engage_mag_get_microdata("heading") . '><a href="' . esc_url(get_permalink()) . '" rel="bookmark">', '</a></h2>');                 endif;                  if ('post' === get_post_type()) :                     ?>                     <div class="entry-meta">                         <?php                         engage_mag_posted_on();                         engage_mag_read_time_words_count(get_the_ID());                         engage_mag_posted_by();                         ?>                     </div><!-- .entry-meta -->                 <?php endif; ?>             </header><!-- .entry-header -->               <div class="entry-content">                 <?php                 if (is_singular()) :                     the_content();                 else :                     if ($  engage_mag_show_content == 'excerpt') {                         the_excerpt();                     } else {                         the_content();                     }                 endif;                  wp_link_pages(array(                     'before' => '<div class="page-links">' . esc_html__('Pages:', 'engage-mag'),                     'after' => '</div>',                 ));                 ?>                  <?php                 $  engage_mag_read_more_text = $  engage_mag_theme_options['engage-mag-read-more-text'];                 if ((!is_single()) && ($  engage_mag_show_content == 'excerpt')) {                     if (!empty($  engage_mag_read_more_text)) { ?>                         <p><a href="<?php the_permalink(); ?>" class="read-more-text">                                 <?php echo esc_html($  engage_mag_read_more_text); ?>                              </a></p>                         <?php                     }                 }                 ?>             </div>             <!-- .entry-content -->              <footer class="entry-footer">                 <?php engage_mag_entry_footer(); ?>             </footer><!-- .entry-footer -->              <?php             /**              * engage_mag_social_sharing hook              * @since 1.0.0              *              * @hooked engage_mag_constuct_social_sharing -  10              */             do_action('engage_mag_social_sharing', get_the_ID());             ?>         </div> <!-- .engage-mag-content-area -->     </div> <!-- .engage-mag-content-container --> </article><!-- #post-<?php the_ID(); ?> --> 

Thank you in advance.