The Version/Style of Chinese Opera that Jackie Chan, Sammo Hung, Yuen Biao, and Yuen Wah studied is Peking Opera sometimes known as Beijing Opera.
Their Teacher or was Sifu Yu Jim-Yuen who created the China Drama Academy a Peking Opera School in Hong Kong.
Much like other Versions/Styles of Chinese Opera like Cantonese Opera. Peking Opera features Acrobatics, Martial Arts, Singing, Music, and Acting.
Yu Jim-Yuen also studied Northern Chinese Kung Fu btw and he was born in Beijing,China.
His daughter Yu So-Chow (Yu So-Chau) learned Peking Opera from her and became a major Martial Arts Film Star and Film Star in general Hong Kong and technically Mainland China before the CCP took over Mainland China.
One of the most well known thing about the China Drama Academy is the Seven Little Fortunes (Chat Siu Fuk in Cantonese). The Peking Opera Troupe that produced Sammo Hung, Jackie Chan, Yuen Biao.
These highly trained individuals would go on to have amazing and fantastic careers in Hong Kong Martial Arts and Action Cinema and Hong Kong Cinema as a whole as, Actors, Stuntmen/Stuntwomen, Fight Choreographers, and Directors.
Yuen Wah, Yuen Qiu, Corey Yuen Kwai, Yuen Tak just to name a few.