factchecking - what can be put in the knowledge base? can we use chroma db?

[skyrockets-21]

Hi,

Firstly, thank you for creating this great tool for the LLM community!

I have read the example for grounding (https://github.com/NVIDIA/NeMo-Guardrails/blob/main/examples/grounding_rail/README.md) and I am curious what data types can be used in the knowledge base of the factchecking rail? can the chroma db be used directly here?

Thanks!