Need to add randomization to niagara system!

Hello!
I am new to Niagara, followed this tutorial https://www.youtube.com/watch?v=D7yxEuE_SHo
Everything works! But I need to add randomized noise driven “spikes”, as if the particles were data that is going off the charts.

kind of like this

Not sure how to achieve this!

here is the set up:

and this is the scratch module responsible for the sine wave
Cant figure out where I can add tiling moving noise or randomize the value to achieve a less uniform effect?

Thank you!