Hello @Jeevi Danda ,
Welcome to the MS Q&A platform.
I am going through this documentation page and see URL is the mandatory parameter. I don't think you can use the SAP server name and SAP system number to connect using the linked service.
also, I found the below article to get the SAP system URL.
Prerequisite: You must be having SAP GUI Logon pad.
https://blogs.sap.com/2013/12/17/how-to-check-sap-system-url/
I hope this helps. Please let me know if you have any further questions.