Since the series travels freely around the globe, working Shang-Chi in would be a relative no-brainer for an episode set in the East—or anywhere, really. You don’t need any kind of fancy excuse to work in the Master of Kung-Fu.
May and Ward are capable combatants, but Shang-Chi is the man. The team had some trouble when it was up against enhanced foes in the midseason finale. That wouldn’t be a problem with this guy as an ally. He’s crossed paths with S.H.I.E.L.D. and is currently in the Avengers in the comics, so there are obvious links to use.