How can i integrate RAGtouille with DSPy

I have successfully created an index and I can easily search using
RAG = RAGPretrainedModel.from_index("my_index")
results = RAG.search(query,k=2,index_name="/m_index")

How do i integrate it in dspy?
What i want to do is ?
dspy.settings.configure(lm=lm, rm=RAG)

Issue:
retrieve = dspy.Retrieve(k=1)("hello")
TypeError: 'RAGPretrainedModel' object is not callable

Start by reproducing the shown RAGatouille and DSPy snippets and consult the APIs for RAGPretrainedModel and dspy.Retrieve. Determine whether the requested integration is documentation or a supported feature, and consider the work complete when the integration path is clearly documented or implemented with a working equivalent of the reported example.

Written by the indexing model from the issue text.