Writing data to an Excel file stored in Teams

Hi,

I'm trying to write some data to an Excel file that is stored in Teams. 

I am struggling to understand how I can identify the endpoint for this Excel file in Team. 

When I check out the documentation https://docs.microsoft.com/en-us/graph/use-the-api about using the Azure REST API it talks about the following format:

{HTTP method} https://graph.microsoft.com/{version}/{resource}?{query-parameters}

How can I identify the resource for my Test Excel file in Teams? 

If anyone can help me I would be very grateful.