How do I add a new custom/coloumn from a global field in the content types to the admin content form?

I am working on a project that uses a lot of content types. These types represent say the pages in magazine, but are related to the same issue.

If there are MANY issues, and many "pages" - then the default title of the content types may look generic. How can I display say - a custom External Field or custom Internal field - so that one can distinguish the content a little easier.

I need to modify the node_admin_content form - and include this global custom field as part of the body table. How do we go from here?

I've hooked into the admin theme, and I am getting some access or feeler on the form, but how do I modify it accordingly?

function seven_form_alter(&$form, &$form_state, $form_id) {
        drupal_set_message("Form ID is : " . $form_id);
		
		//get node_admin_content
		//$nodeAdmin = drupal_get_form("node_admin_content");
		
		
		  // Add a checkbox to registration form about agreeing to terms of use.
  $form['node_admin_content']['poland'] = array(
    '#type' => 'checkbox', 
    '#title' => t("I agree with the website's terms and conditions."), 
    '#required' => TRUE,
  );
		
}