Use this variant to make the slot able to fill/drain mana from the machine internal buffer to/from an mana container item placed in that slot.
The fill/drain behavior is determined by the "mode" property of the item component :
"variant": "custommachinery:mana"
Any mana container items (mana tablets, mana band,...) that match the filter defined in the item component "filter" property.
A simple mana slot that transfer the mana from the item to the machine internal buffer :
{
"type": "custommachinery:item",
"id": "manaInput",
"mode": "input",
"variant": "custommachinery:mana"
}