Hi Gabriel,
The xml schemas for the .NET datatable and the UI API datatable are completely different so you'll have to do some sort of conversion. XSLT would be one way to achieve this. I've never tried but it's probably straightforward if you only need to write it for this specific conversion (ie where you already know the structure of both datasources) but more of a challenge if you want to create a generic method to convert any .NET datatable to a UI API datatable.
Kind Regards,
Owen