How to get the total number of elements of a nested sequelize model?

Question

PostgreSQL

Hello, please tell me how to get the total number of elements of the sequelize nested model?
It is necessary that include returns, in addition to the array of all nested models, also count (the number of all nested models)
I will be grateful for the answer

const Product = sequelize.define('product', {
  id: { type: DataTypes.INTEGER, primaryKey: true, autoIncrement: true },
  name: { type: DataTypes.STRING, unique: true, allowNull: false },
})

const ProductVariant = sequelize.define('product_variant', {
  id: { type: DataTypes.INTEGER, primaryKey: true, autoIncrement: true },
  title: { type: DataTypes.STRING, allowNull: false },
  img: { type: DataTypes.STRING, allowNull: false },
  color: { type: DataTypes.STRING, allowNull: false },
  price: { type: DataTypes.INTEGER, allowNull: false },
  model: { type: DataTypes.STRING, allowNull: false },
})

Product.hasMany(ProductVariant, { as: 'variant' })
ProductVariant.belongsTo(Product)

products = await Product.findAndCountAll({
        include: [
          {
            model: ProductVariant,
            as: 'variant',
            limit: 4,
            order: ,
          },
        ],
      })