groundhogg/admin/{slug}/{current_tab}
This hook is used to add custom code in the tab layout page. This hook accepts the current tab value in tab thus users will be able to display custom code for a specific tab on the page.
do_action( "groundhogg/admin/{$this->get_slug()}/{$this->get_current_tab()}", $this );
This hook comes with the object of the tabbed admin page class argument.