Let's take a simple example:

I have a tube and a grid. I use CopyToPoints SOP to copy the tube to the points of the grid.
I know that I can use AttributeRandomize SOP to randomize attributes like "pscale" or "orient".
But, I'd like to randomize individual parameters of the tube like "Radius Scale" or "Columns".
My background is, that my object is not a tube but a more complex object with lots of parameters.

Is there a way to do this?

Ok, found it out myself.

I have to use foreach around CopyToPoints and reference the ForEachBegin SOP from a point expression in the source object.