We don't have an official Excel library. You can get live market data in Excel using the Kite Connect API by integrating it through third-party tools by writing custom code in Python or VBA that connects to Kite's WebSocket API. You may refer to the similar discussion in this thread.
There is no direct API endpoint/stream to fetch the option chain. You need to build it at your end by filtering instruments and fetching OI/LTP/volumeusing Websocket streaming or Quote APIs, depending on your usability. This thread explains a basic flow to create an option chain.
You may refer to the similar discussion in this thread.