Allow adding custom columns to app related tables

Usually in classes that extend WP_List_Table, the column_default function calls a action that allows you to add custom column content:
column_default:
do_action( "manage_{$this->screen->id}_custom_column", $column_name, $item );

ie. to add a custom column to the manual notifications list you can do:

\add_filter( "manage_manual-notifications_columns", [ $this, 'get_columns' ], 50 );

public function get_columns($columns)
{
    $columns['date_schedule'] = 'Scheduled At';

    return $columns;
}

But there is no way to add content to the new column because ManualNotificationList::column_default() just returns N/A where it should fire a hook.