Secondary Title is a simple, light-weight plugin that adds an alternative title to posts, pages, and/or custom post types, which can be displayed automatically, with a shortcode or by using PHP.

The plugin comes with an extra settings page, which allows you to customize the plugin according to your needs. You can change:

• post types, categories, and specific post IDs the secondary title will be
  shown on,
• whether the secondary title should be automatically added to the standard title (Auto show),
• the format both titles are being shown (only works when Auto show is activated),
• the position where the secondary title input field should be displayed (above or below the standard title) within the admin interface (Classic Editor only),
• whether the secondary title should only be displayed in the main post and not within widgets, etc.,
• if the secondary title should be usable in permalinks,
• and even more.

Please see the official website for a full documentation.