If you would like to see the slave narratives already on WikiTree, here is the overall category: United State of America, Slave Narratives. This will show you the states in which there are slave narratives on WikiTree! Then you can look in each state, usually by county, to find the individual slave narratives.
They often have great clues to genealogical information, (that needs to be verified by sources, of course) and often will provide a connection to the slave owner that could help connect other enslaved ancestors as well.
LoC has some of these...
https://www.loc.gov/collections/slave-narratives-from-the-federal-writers-project-1936-to-1938/about-this-collection/?&loclr=reclnk