Unable to identify Iron's Spellbook Curios slot

Bugged Power:

{
    "name": "§nSoulbind§r",
    "description": "A magical phenomenon that keep all items in hotbar after death including worn spellbooks.",
    "type": "origins:keep_inventory",
    "slots": [
	"spellbook",
        0,
		1,
		2,
		3,
		4,
		5,
		6,
		7,
		8
    ]
}

mod-sources:

https://legacy.curseforge.com/minecraft/mc-mods/irons-spells-n-spellbooks/relations/dependencies?filter-related-dependencies=3
https://legacy.curseforge.com/minecraft/mc-mods/curios

p.s - i already tried curios:spellbook

The slots field of the keep_inventory power type currently only accepts numerical slot IDs. It also only works for the player inventory, not custom inventories like Curios' inventory, so specific compatibility will have to be implemented (same for Trinkets with Origins in Fabric)

The slots field of the keep_inventory power type currently only accepts numerical slot IDs. It also only works for the player inventory, not custom inventories like Curios' inventory, so specific compatibility will have to be implemented (same for Trinkets with Origins in Fabric)

I see.. i hope we can see something come to effect soon