Add support for Excel as a data source in OneDrive via graph API
Add support for the OneDrive document interaction graph API, specifically for excel documents as an option to add support for excel as a data source.
currently the only options are to use a 3rd party service to convert to a json at cost or use google sheets.
if you do not wish to use either of these services you are stuck not being able to access data from csv/xlsx files.
https://docs.microsoft.com/en-us/graph/api/resources/excel?view=graph-rest-1.0

Great idea. Let's see how much interrest there is.
The Excel API has options to work with tables. This could be a simple alternative to any other data store.