Here are some examples:

Penny Wong, minister for Foreign Affairs and leader of the Government in the Senate of Australia.

Elaine Chao, Secretary of Labor under President Bush, and Secretary of Transport under Donald Trump.

Doug Chin, briefly Lt. Governor of Hawaii

No ethnic Chinese person has held a Cabinet-level post in the Westminster government, though Alan Mak was a government whip and (briefly) a treasury minister.

One commonality among these four, very different politicians, is a rejection that they represent a community or ethnic group. Generally, members of the Chinese diaspora are politically diverse and don't identify with any particular party in the UK, USA or Australia.