metafield variables are not working for shop metafield for cart checkout validation function

[jaspreetAxt]

I have created metafiled on shop which is working fine. However am unable to pass the variables.
in RunInput $selectedProducts supposed to send the values but it is not.

query RunInput($selectedProductTags: [String!], $selectedCollectionIds: [ID!]) {
  cart {
    lines {
      quantity
      merchandise {
        __typename
        ... on ProductVariant {
          id
          weight
          product {
         
            hasTags(tags: $selectedProductTags) {
              hasTag
              tag
            }
          }
        }
      }
    }
  }
  shop {
    metafield(
      namespace: "$app:my_cart_checkout_shop_namespace"
      key: "my_cart_checkout_shop_key"
    ) {
      value
    }
  }
}

As mentioned in the doc that variables need to be declared into the toml file is already being declared

  [extensions.input.variables]
   namespace: "$app:my_cart_checkout_shop_namespace"
   key: "my_cart_checkout_shop_key"

[nickwesselman]

As specified in the docs, input query variables need to be set on the function owner. Checkout validation doesn't currently expose a function owner on which to set metafields, but this is in their roadmap.

[nickwesselman]

Support for this can be tracked here.