Shorthand app-owned Metafields in Storefront API?

 const productVariantDefinition = {
    access: {
      admin: "PUBLIC_READ_WRITE", //change to MERCHANT_READ for production
      storefront: "PUBLIC_READ"
    },
    name: "Metafield Test",
    namespace: "$app:namespace",
    key: "preorder",
    type: "json",
    ownerType: "PRODUCTVARIANT"
  };

query Product($product: String!) {
  product(handle: $product) {
    variants(first: 250) {
      edges {
        node {
          longform: metafield(
            namespace: "app--169107947521--namespace"
            key: "metafieldkey"
          ) {
            namespace
            key
            value
          }
          shortform: metafield(namespace: "$app:namespace", key: "metafieldkey") {
            namespace
            key
            value
          }