All you need is the connection string of your database or location of your source files and your CosmosDB keys. If you are using a database as source, you can format the data model pretty easy. You might have issues if the source you use does not have a JSON data type. JSON Array might look like string in CosmosDB because of data type mapping problems.
I am going to use CSV file as source in the following example. You can’t define a column as JSON array in excel. I have the following two columns in my CSV file. If I import these values into CosmosDB as they are, I see coordinates field’s data type will turn into a text field in CosmosDB. You can go back and try to update them in CosmosDB but that will be an expensive solution.
The one downside to this tool is that it doesn’t work with collections defined using the Mongo API.