Multi Builder Tool

MbtoolKJSEvents.InitMbtoolStructures(event => {
    for(let i = 0; i < event.structures.length; i++) {
        console.log(event.structures[i].getId());
        console.log(event.structures[i].getName());
        console.log(event.structures[i].getStructureNbt());
        console.log(event.structures[i].getGroup());

        event.structures[i].setStructureNbt(CompoundTag.fromJSON({})); // set structure nbt (you can use this to change the structure, but be careful!)
        var nbt = event.structures[i].getStructureNbt(); // get structure nbt
        nbt.palette[0].Name = 'minecraft:iron_block'; // change first block in palette to iron block
        event.structures[i].setStructureNbt(nbt); // set structure nbt again
        //if you wish to remove structure, then set some non existing block
        nbt.palette[0].Name = 'minecraft:not_existing_block';
        event.structures[i].setStructureNbt(nbt); // set structure nbt again

        // Example if you wish to pack all reactors into Group
        if (event.structures[i].getId().toString().toLowerCase().includes('reactor')) {
            event.structures[i].setGroup('Reactors');
        }
    }
});