import datatype for a REST web service

Hi,
We are importing a lot of (Rest) web services. In the web service, you can see the datatype’s for all the columns. The result for the procedure are all string (4000), and the table we make of the procedure it’s string (10). Can we get the actual datatypes without changing everything manually?
Is there an option in the wizard we don’t know?
Example web service:
8725724278038038
2016-01-15T09:07:19.502Z
505492684

Greeting Rob