Ask HN: Spreadsheet LLM Understanding

I am working on a financial platform for private investors and I am tasked to create a service that can ingest spreadsheets (financial statement mostly like P&L) and use a LLM to retrieve data, chat about their content, create structured outputs.

Has anyone found a good API?

Direct CSV/File ingestion/ExcelToImage on the main LLMs does not provide a good accurate solution at the moment. Other services like https://unstructured.io/ or llamaindex apis are not accurate either.

This new service may work but I have not tried it yet: https://www.llamaindex.ai/blog/introducing-the-spreadsheet-agent-in-private-preview