It is common. The Chinese commentator Gu Li mentioned pair game and team game. But I cannot find an English page about it. Here is a Chinese Wikipedia page. https://zh.m.wikipedia.org/zh-hans/团队围棋
FWIW, the five people team played with Ke Joe before the game and won (again, according to Gu Li.)
FWIW, the five people team played with Ke Joe before the game and won (again, according to Gu Li.)