How to correctly build a schema with nested attributes?

Question

MongoDB

Hello. There is a product catalog and a product model in particular, you need to organize a schema for it, while doing so, but you don’t like that there is no validation for the internal details fields, should they be added? it’s just that there can be about 100 of them, since there are a lot of goods and the set of these attributes is quite different.

What it looks like now: