Hi there,
you could use the WordPress Custom Fields (CF):
https://wordpress.org/support/article/custom-fields/
For this example we are creating a CF called reviewer
Once the CF is set we can add some code to output it to the site using a Hook Element:
https://docs.generatepress.com/article/hooks-element-overview/
Create a new hook give it a title and add this to the content:
<?php
$reviewer = get_post_meta($post->ID, 'reviewer', true);
if ($reviewer) { ?>
<span class="reviewers-name" itemprop="name"><? echo $reviewer; ?></span>
<?php
} else {
// display nothing;
}
?>
Select the after_entry_title
hook, check Execute PHP and set the display rules to Posts > All Posts. If you want it to display on the Blog and Archives. Then you can add them as additional locations.