Richmond Mayor Dwight C. Jones is expected to weave his personal story into the city’s historical ties to slavery today as he makes his pitch for a Shockoe Bottom development plan that includes both a baseball stadium and a heritage site to commemorate what was one of the largest slave markets in antebellum America. The long-anticipated Shockoe plan, which would involve private and public investment of more than $200 million, also includes a Kroger grocery store, a Hyatt hotel, 750 apartments and a parking deck, according to prepared remarks and other materials provided to the Richmond Times-Dispatch, but the slavery memorial is a key component that could defuse some of the opposition to a ballpark in Shockoe Bottom.