Save the two components of the model as two separate STLs. Then, select both STLs and “load as a single object” when importing to Studio. Then, you will be able to select and assign filament type to each component separately, but the slicer will still treat the combined components as a single object for slicing purposes.
What you want to do isn’t any different than doing a multi color print, and the same techniques you use for that are the same techniques you want to use here. So just look for threads talking about multi color prints to get more help on how to do this.