Fetching options chains/data via websocket

HI

Using websocket is how to Fetch options chains/data . What should be the request Key

Example for spx options : ""0#SPX*.U" ,I need to extract following fields
[DSPLY_NAME","UNDERLYING","EXPIR_DATE","STRIKE_PRC","PUTCALLIND","PUT_CALL","OPINT_1"]"

I'm looking to archive this via web socket using DACS API
https://community.developers.refinitiv.com/questions/49557/eikon-net-apis-fetch-options-chainsdata.html

Thanks
Bopanna

@Jirapongse @bopanna.alemada