I looked into the a while ago. There are some other options but the only ones that appear to be fairly robust are manipulation from either Microsoft Flow or Powerapps. Both of which are sort of "citizen development" visual type environments.
There is a second choice that works more like the Google sheets API...the Microsoft Graph API: https://docs.microsoft.com/en-us/graph/api/resources/excel
When I last tried it, it was somewhat limited in functionality.