Assigning consumables tot he skill bar with a controller

Recently I have bought myself a controller and I am enjoying the game a lot!
A completely different experience from mouse and keyboard and I have to be honest I am liking it a lot.

I have now a problem and I was wondering if any of you knows how to assign a consumable to an active controller button. In particular I would like to assign an aether cluster but it doesn’t show up in the list of assignable items.

There is any workaround for this?

Thank you!