Three straight years of losses from Chinese markets and anti-Beijing rhetoric from Washington have not deterred some U.S. asset managers from introducing products they hope will thrive if Chinese stocks rebound. China's markets have been hit by a long-lasting property crisis, slowing growth and geopolitical tension. The Institute of International Finance estimates $80 billion of outflows from Chinese portfolios last year, and the bellwether blue-chip CSI 300 Index has fallen 43% from its record high of three years ago.