Add custom info to WordPress site health tab

add_filter( 'debug_information', 'add_plugin_details', 10, 1 );

function add_plugin_details( array $args ) : array {
  
  $args['plugin-slug'] = [
  
  	'label'       => esc_html__( 'My Plugin Section', 'text-domain' ),
	'description' => esc_html__( 'A description of what this section is about.', 'text-domain' ),

	/* The fields you would like to add within the section. */
	'fields' => [
		/* Each field should have a unique key, this is displayed within copy/paste text. */
		'unique_plugin_key' => [
	    
	    /* The label of the field. */
		'label' => esc_html__( 'This is the field text', 'text-domain' ),
			
	    /* The value of the field (string, integer, float or array). */
	    'value' => 'value',
	    /* Additional field info that should be added to the copy/paste text. Otherwise false. */
		'debug' => 'value',
	    /**
	     * Set this to true if the value should not be added to copy/paste functionality.
	     * 
	     * You should hide product keys and sensitive info. Basically anything that would be bad if
	     * it ended up in a public forum.
	     */
	     'private' => false
		]
	]
  ];
  
  return $args;
}

Source: https://www.tannerrecord.com/how-to-add-plugin-info-to-wordpress-site-health/