How to set line attractor's end points in blueprint?

Hello! I’ve created a particle system with point and line attractors in order to make my particles fly around the center of PS in a spiral manner (somewhat similar to the first video-example in documentation, but mine also get higher with time, see attached image). Now I need to make this PS customizable (so that I can set the height and radius). So far I was trying to achieve this using blueprint created from my PS. The problem is that I can’t set line attractor’s end points in the blueprint which is an important thing to do in order to achieve desired effect. Is there any not-so-obvious way to set the end points via blueprints or any other way to end up with the same but customizable PS?