Derik Hammer has an introductory article showing how to work with CosmosDB to store and use document-style data:
Querying Cosmos DB is more powerful and versatile. The CreateDocumentQuery method is used to create an IQueryable<T> object, a member of System.Linq, which can output the query results. The ToList() method will output a List<T> object from the System.Collections.Generic namespace.
Derik also shows how to import the data into Power BI and visualize it. It’s a nice article if you’ve never played with CosmosDB before.