How to achieve randomized "value" parameters of primitives after instancing

My problem: I instance a primitive with very specific “value” inputs for its creation on points. Now as a field, how would i randomize those inputs. (something simple like scale or rotation or trims of curves is always doable after the instancing - but something like the sweep of an arc primitive etc.

You can control each object parameter with For Each Element node

@higgsas - so thankful for this. Brilliantly explained. Opens up a whole new world of geonode possibilities I was never aware of.