Check out this thread, specifically Jasper's comment and solution. I assume you have the same issue.
Thanks, that definitely helped! I have been able to import the APIs response into Mendix now. However, I'm stuck at another point now. The API responds with an array within an array:
"rows": [ [ "value 1", 123.212, true ], [ "value 2", 542, false ], [ "value 3", 342, false ], [ "value 4", 5452, false ], [ "value 5", 32, true ] ]
I know I should work with the RESTServices.Primitive call to translate arrays into entities, however, that only seems to work properly for an array with a name right before it, not for an array within an array. Any ideas on this?