Jonathan, if you’re still looking for a way to accomplish something like this , I thought I should share some insights on the matter.
The main problem on doing a wiggle like you suggested in Maya arises from the fact that an attiribute can only be plugged in from one source ie. keyframe ( which is an animation node’s output btw ) or an expression , not both.
You can of course build up huge networks of nodes which contribute to your final animation and then connect that to your attribute but to build up this kinda “works with any keyed attribute anywhere in Maya” - solution would be insanely laborious, in my humble opinion.
Instead I encourage you to seek solutions based on your exact needs, for example if you need a wiggle on transformation, use the deformer or if you need a wiggle in scale, write an expression. You can use animation layers, character nodes to get nonlinear trax clips and so on and so forth. The way you can animate in Maya is so much more broader than in AE.
In time you’ll learn how Maya’s DG works and you can refine the methods used but for starters I recommend on reading about it from the manuals.
perhaps this :
and about the basics of Maya’s DG & DAG :
and finally about the technicalities, MEL & expression :
I know that the road may seem long but trust me, it’s well worth it
Hope this helps.