Description: We are actively using the MarketData API to fetch stock price and earnings data using symbols such as AAPL.NQ or UNH.NY. However, for several use cases—including regulatory reporting, portfolio analysis, and external data integration—we also require the ISIN (International Securities Identification Number) associated with each symbol. Requested Feature: Please provide a new endpoint (or extend an existing one) that allows users to query a symbol and receive the corresponding ISIN in the response.