AWS AppSync add Gatsby-Image Fluid Image as foriegn key to Other GraphQL Model

Question

How would I add a gatsby-image type to a field on a graphQL model like below?

type PortfolioItem @model {
 id: ID!
 name: String
 Image: ?????
 ......other fields
}

I know im supposed to create a foreign key with another object, but how do I make another model for gatsby-image to attach as a foreign key?!?!

The json for the image is generated by this:

file(relativePath: { eq: "websites.jpg" }) {
      childImageSharp {
        fixed(width: 650) {
          ...GatsbyImageSharpFixed
        }
      }
    }

How on earth, do I add this as a field on a graphQL model so I can perform gatsby page queryies like below:

gql`query MyQuery {
    getPortfolioItem(id: "12314") {
        image: file(relativePath: { eq: "websites.jpg" }) {
            childImageSharp {
                fixed(width: 650) {
                    ...GatsbyImageSharpFixed
                }
             }
        }
    }
}

So the returned JSON would look like:

{
  name: 'something',
  image: {
    ...whatever JSON is returned by the gatsby-image function above
  }
}