Grashopper Fillets to seperated volumes


on the base of the from Food4Rhino I build the stair in the attached screenshot.
The steps are 15 seperated volumes and different in dimension.
I would like to fillet all their edges and found this tutorial:

But he’s doing it on a single volume and has therefore only a few edges.
I have 90 faces, but no idea how to do it.

I’m sure it’s to easy…
Thank you !