Does anyone know if I can add a free stopover when booking through VS?

On this page under "Points to Note," it states one free stopover in each direction is allowed and specifically gives this example as an applicable itinerary: Los Angeles-Taipei-Bangkok-Taipei-San Francisco
https://www.china-airlines.com/us/en.../ticket-awards

That would be perfect for me because we're going to Thailand after Taipei and need to get back to Taipei for our inbound flight back to the states.