Possible to use relationships for Identity?

defmodule One.Exam.QuestionParagraph do
  use Ash.Resource,
    data_layer: AshPostgres.DataLayer

  postgres do
    table "question_paragraphs"
    repo One.Repo
  end

  actions do
    defaults [:create, :read, :update, :destroy]
  end

  attributes do
    uuid_primary_key :id
    attribute :ordinal, :integer
    attribute :text, :string
    attribute :image, :string
  end

  relationships do
    belongs_to :question, One.Exam.Question
  end

  identities do
    identity :order, [:ordinal, :question]
  end
end