How can I access the ID of the parent object inside a object entension

Question

I have a class User with a property Id. I also have some binary data in my file system for each instance of that class - the names of the files are the Id of the object. I've written a type extension to provide a field with the text content from the files:

[ExtendObjectType<User>]
public sealed class UserExtensions
{
    private readonly IStorageReaderWriter readerWriter;

    public UserExtensions(IStorageReaderWriter readerWriter)
        => this.readerWriter = readerWriter;

    public async Task<string?> GetData([Parent] User user, CancellationToken cancellationToken)
        => await this.readerWriter.Read($"{user.Id:D}.json", cancellationToken).ConfigureAwait(false);
}

This works fine as long as I query the user with its Id:

query {
  users{
    id
    data
  }
}

In this case, GetData gets a User instance with the Id already set and can look up the file content by this Id.

As soon as I omit the Id in the query, it's not populated in the User for the GetData method. So, this query returns a list with data = null, because for each record User.Id is null.

query {
  users{
    data
  }
}

Is there a way to tell hot chocolate that I need the Id property, regardless whether the client query requests it or not?