Hi @SCHR_ARTELIA! 
We haven’t implemented the converted load results into the API yet. For missing result types you can use the FemDesignConnection.GetResultsFromBsc() method. (link to the method)
The input parameters are the file paths of the .bsc and the .csv files. First you will need to manually create a batch file using the FEM-Design GUI. If you don’t know how to do it, check the following link: Get results from bsc
This paragraph explains how to do it for a Grsshopper component, but the way to create a .bsc file is the same for both.
You specify the listing result type when you create the batch file. The GetResultsFromBsc() method will list the results into a .csv file and read them from the .csv. The output is a list of strings containing the selected results. You can filter the data before creating the batch file by clicking on the ‘Format table…’ button.
Hope this helps. Let me know if you have any further questions. 