Typescript Generics for nested array of objects

Hello i am trying to add correct type to object with nested values.

Here is code in sandbox: https://codesandbox.io/s/0tftsf

interface Product {
  name: string,
  id: number
  productList?:ProductItem[]
}

interface ProductItem { 
  color: string, 
  size: number 
 }


type IValidation<T> = {
  field: keyof T
  nestedValidations?: IValidation<
    Pick<
      T,
      {
        [K in keyof T]-?: T[K] extends object ? K : never
      }[keyof T]
      >
    >[] // THIS IS IMPORTANT FOR QUESTION!
  validators?: (any | any | any)[]
}

export async function validateIt<T>(payload: T, validations: IValidation<T>[]): Promise<
  Partial<{
    [key in keyof T]: string[]
  }>
  > { 
    return Promise.resolve(payload);
  }

const product: Product = {
  id: 1,
  name: 'playstation',
  productList: [{
    color: 'red',
    size: 32
    }
  ]
}

const test = validateIt<Product>(product, [
  {
    field: "productList",
    validators: [],
    nestedValidations: [
      {
        field: 'color',
        validators: []
      }
    ]
  }
])

So getting type error and overall i am trying to find correct type for nestedValidations property, which should match interface Product

from Typescript Generics for nested array of objects