Question regarding 72 hr/144 hr visa

We are flying from Mandalay, Myanmar to Shanghai PVG (spending 1 day) and then flying back to USA the next day. But in between Mandalay and Shanghai the plane connects for about 4 hours in Kunming. Question is whether we can apply for the 72hr or 144hr free transit when landing in Shanghai for our 2 your kids??? (Note - we already have a 10 yr visa but our kids do not). Please let us know thank you