I am trying to apply the method used in topic to manage different prices of a same item based on its selected criteria : MongoDB Schema for ecommerce products that have variations with different SKUs, prices and stock

But regarding this scheme :

dimensions: {
  color: {
    title: { type: String },
    red: {
      title: { type: String },
      images: [{ type: String }],
    },
  },
  size: {
    title: { type: String },
    s05: {
      title: { type: String },
      images: [{ type: String }],
    },
  },
  variations: [
    {
      dimensions: {
        color: { type: String },
        size: { type: String },
        fireretardant: { type: String },
      },
      SKU: { type: String },
      price: { type: Number },
    },
  ],
},

When I try to create an object, I get this error :

file:///C:/Users/ReactProject/shop-v2/backend/data.js:68 dimensions: { color: red, size: s1, fireretardant: no }, ReferenceError: red is not defined

How to get Mongoose to consider red & size as defined ?

dimensions: {
        color: {
          title: "Color",
          red: {
            title: "Red",
            images: [
              "http://myserver.com/images/product_12345_3",
              "http://myserver.com/images/product_12345_4",
            ],
          },
        },
        size: {
          title: "Size",
          s05: {
            title: "0.5 m",
            images: [],
          },
        },
        variations: [
          {
            dimensions: { color: red, size: s1 },
            SKU: "98765",
            price: 10,
          },
        ],
      },