A survey of 600 likely general election voters in Michigan, released late Thursday by WDIV Local 4/Detroit News, found that zero African American respondents said that they supported Trump, while 82.1 percent said they supported Vice President Kamala Harris.
Unfortunately if this is the poll from last week there were only 100 black people included, so it is very small for the subgroup. However neither this article nor the link they left have the full breakdown, this is just from memory