How can you collect information in the product from additional fields of similar products (by model) or some additional field

The essence of the problem: There are several products with the same model range, that is, for example, there are 5 products, they are all the same, only they differ in size (XS, S, M, L, XL). How can you collect these values of other products in the product by model or by additional field, that is, it is necessary that (XS, S, M, L, XL) is displayed in the additional field in each product If, for example, there are only 3 products (XS, S, M) for some model, then you need to collect the values for these 3 products and write them in the field. In the automation of products, there is such an action "Copy fields and filters of the product when the conditions are met", something similar to the need to do, but on the contrary, that is, not to copy to similar products according to the model, but on the contrary to collect the values of the fields from the model and record them in an additional field of the product How can it be done in the system?