Django models of an online store

I'm puzzling over the problem, but I realize that I can't solve it myself.

Problem description:

Let's say there is an online store with the following models: 'Category', 'Subcategory', 'Basis', 'Property', 'Product'.

As you can see, the Basis model has added a link to the property - M2M model, so we get the necessary characteristics for the product group, instead of choosing the characteristics for the product by separately.

Question:

At the moment, we have a Basis that assigns the same characteristics to a product group* - the Property model. But if you select the values* (the data field of the Property model) in the Property model, the values are duplicated accordingly, as well as the characteristics themselves for each product.

(*a small example in terminology: Characteristics - "width": Values - " 100";)

How do I assign values for characteristics? To each Product located in its Basis had the same characteristics, which in turn had different values relative to the product.

Briefly about the methods that I tried to implement:

I tried using Django EAV, the Contenttypes framework, JSONField.

I went through a lot of questions in Google regarding the implementation of characteristics, but I didn't find any specifics. I reviewed a lot of questions regarding these methods. From this in total, the most sensible thing that I found is, and that did not help me. I still don't understand how to implement this in my task.

I am sure that the solution lies in the correct implementation of these methods, but I could not exactly figure out any of them. I suspect that Data should be a separate model, but I can't think of how to link it to Product, and that's it.

If so, please tell me how to do it correctly and intelligently, I have already blurred my brain and can not come to a decision I can take a long time. Thanks.

#models/product.py

class Category(models.Model):
    """ Category of products """
    name = models.CharField('Название категории', max_length=250)
    alias = models.CharField('Алиас', max_length=200, db_index=True)
    slug = models.SlugField(max_length=50, unique=True)
    icon_field = models.ImageField('Изображение', blank=True, null=True, upload_to='category_icon/')
    ...


class Subcategory(models.Model):
    """ Subcategory of products """
    name = models.CharField('Название подкатегории', max_length=250)
    alias = models.CharField('Алиас', max_length=200, db_index=True)
    slug = models.SlugField(max_length=50, unique=True)
    categories = models.ForeignKey(Category, verbose_name='Категория', on_delete=models.SET_NULL, null=True)
    icon_field = models.ImageField('Изображение', blank=True, null=True, upload_to='subcategory_icon/')
   ...
  


class Property(models.Model):
    """ Properties of products, tec-info """
    name = models.CharField('Свойство', max_length=200, db_index=True, unique=True)
    alias = models.CharField('Алиас', max_length=200, db_index=True)
    data = models.CharField(max_length=200, verbose_name='Значение')
    slug = models.SlugField(max_length=50, unique=True, db_index=True)
    ...


class Basis(models.Model):
    """
        Basis (of products which have same tec info and properties, as group of same products in Basis)
        That decision easy to use*, than get property separate to each product. In this decision you can 
        get the list of properties to basis and this list of properties will be displayed in group of 
        products which is includet to Basis object.
        Also this decisions uses to large markets which have big nomenclature, and different association 
        with naming of categories
        *Easy to use - is when you assign some properties to group of products, instead assign properties 
        to every product
    """
    name = models.CharField('Название основы', max_length=250)
    alias = models.CharField('Алиас', max_length=200, db_index=True)
    slug = models.SlugField(max_length=50, unique=True)
    subcategories = models.ForeignKey(Subcategory, verbose_name='', on_delete=models.SET_NULL, null=True)
    properties = models.ManyToManyField(Property, verbose_name='Свойство', related_name='property')
    icon_field = models.ImageField('Изображение', blank=True, null=True, upload_to='basis_icon/')
    ...


class Product(models.Model):
    """ Products in catalogue """
    name = models.CharField('Название продукта', max_length=250, db_index=True)
    brand = models.ForeignKey(
        Brand,
        verbose_name='Бренд',
        on_delete=models.SET_NULL,
        null=True,
        related_name='brands'
    )
    collection = models.ForeignKey(
        Collection,
        verbose_name='Коллекция',
        on_delete=models.SET_NULL,
        null=True,
        related_name='collections'
    )
    article = models.CharField('Артикул', max_length=250, db_index=True)
    slug = models.SlugField(max_length=50, unique=True, db_index=True)
    description = models.TextField('Описание')
    price = models.DecimalField('Цена', max_digits=10, decimal_places=2)
    available = models.BooleanField('Наличие товара', default=True)
    created = models.DateTimeField('Дата и время создания товара', auto_now_add=True)
    updated = models.DateTimeField('Дата и время последнего изменения', auto_now_add=True)
    title_img = models.ImageField('Изображение', upload_to='products/')
    categories = models.ForeignKey(
        Category,
        verbose_name='Категория',
        on_delete=models.SET_NULL,
        null=True,
        related_name='categorys'
    )
    subcategories = models.ForeignKey(
        Subcategory,
        verbose_name='Подкатегория',
        on_delete=models.SET_NULL,
        null=True,
        related_name='subcategorys'
    )
    basis = models.ForeignKey(
        Basis,
        verbose_name='Основа',
        on_delete=models.SET_NULL,
        null=True,
        related_name='basises'
    )
    ...

In the code, everything superfluous that is not related to the question is allowed so that it does not distract from the question