Landscape Spline data in PCG

When bringing a landscape spline into PCG, you can see that the spline contains all the data about the road width and falloff width, as it’s displayed as density.
How can you actually access that data within PCG? I have tried partitioning this into different splines, but it behaves differently than other splines and the index order is based on the order that the points were placed rather than along the flow of the spline, so I cannot rebuild the splines.
If there was even a way to access the parameters that were used to set that on the original spline, I could use that, but Actor properties cannot grab that either.
It would even be helpful to understand how this data is different than a non lnadscape spline that you might import.