It’s a hyperbolic relationship. You need to amount for baseline serum levels, baseline dietary intake, and change in dietary intake
https://academic.oup.com/ajcn/article/55/6/1060/4715430
If you have high serum cholesterol and high dietary cholesterol intake, adding more will produce minor changes. If you have low serum cholesterol and low dietary cholesterol intake, adding more dietary cholesterol will produce large changes. If you want optimal cholesterol levels you likely need to reduce dietary cholesterol to zero