populate items from promotion node express js

promotion Modele

    const mongoose = require("mongoose");

const PromotionSchema = mongoose.Schema({
    name: { type: String, required: true },
    item1: {
        type: mongoose.Schema.Types.ObjectId,
        ref: "itemPromotion",
        required: true,
    },
    item2: {
        type: mongoose.Schema.Types.ObjectId,
        ref: "itemPromotion",
        required: false,
    },
    item3: {
        type: mongoose.Schema.Types.ObjectId,
        ref: "itemPromotion",
        required: false,
    },
    

    startDate: { type: Date, required: false },
    endOfDate: { type: Date, required: false },
    status: { type: Boolean, required: false },
    totalPrice: { type: Number, required: false },
    discount: { type: Number, required: false },
});
module.exports = new mongoose.model("Promotion", PromotionSchema);

promotion Items its item with price and quantity and discount pourcent in promotion

    const mongoose = require("mongoose");

const ItemPromotionSchema = mongoose.Schema({
    item: { type: mongoose.Schema.Types.ObjectId, ref: "Item", required: true },
    price: { type: Number, required: true },
    quantity: { type: Number, required: true },
    discount: { type: Number, required: true },
});

module.exports = new mongoose.model("itemPromotion", ItemPromotionSchema);

items its the orginal item

const mongosse = require("mongoose");

const ItemSchema = mongosse.Schema({
code: {
type: String,
required: true,
},
label: {
type: String,
required: true,
},

itemCategory: {
    type: mongosse.Schema.Types.ObjectId,
    ref: "ItemCategory",
    required: false,
},
// category: {
//     type: CategorySchema,
//     required: false,
// },
itemFamilly: {
    type: mongosse.Schema.Types.ObjectId,
    ref: "ItemFamilly",
    required: false,
},
description: {
    type: String,
    required: false,
},
picture: {
    type: String,
    required: false,
},

Price: [{
    type: mongosse.Schema.Types.ObjectId,
    ref: "Price",
    required: false,
}, ],
tempPrice: { type: Number, required: false },

active: {
    type: Boolean,
    required: true,
},

});

module.exports = new mongosse.model(“Item”, ItemSchema);

and I have also the methode get (route)
where I need to get my data
promotion with itemsPromotions with label of item

   router.get("/config", async(req, res) => {
    try {
        const PromotionInDataBase = await Promotion.find().populate("item1").populate("item1.item");

        res.json(PromotionInDataBase);
    } catch (error) {
        res.json({ message: error });
    }
});