Setting Up LLM-App Traces in Phoenix: Adding Embedding Span Guidance

Hi, I am trying to setup an llm-app and try to see my traces in phoenix. I am using

https://github.com/Arize-ai/openinference/tree/main/python/examples/dspy-rag-fastapi

to create some traces and check in phoenix. I have seen llm-demo on arize ui, and in that for a retrieve span, I see an embedding span also under the retrieve call. But here, i just see retrieve call, no embedding call on the input string, can anyone point me out on what can I do to see embedding span also? Like is there a config change that i need to do, or?