Th desire entry should include a unit and a separate NBT path to look up an amount in an item. If the fluid system is separate from NBT, we'll want to support that in a hopefully transparent way. The goal is to support the Moloch demands for IE fluids, but it may be worth determining what types of things this may apply to.

The system should be robust. It shouldn't crash if nbt isn't there as expected. How NBT is affixed to stackable items may matter (can you affix NBT to stackables and then stack them) and we want the system to be robust in case this changes (no crashing).

Visually it may make sense to move the amounts back to the right of the rendered desire as things like fluid can be quite large, and I have no idea how this applies with other stuff, but this should be a consideraiton.