How to do complex data transformation in Mendix studio

Hi Team,   I am unable to find any "activity" in a micro flow to perform a complex transformation while integrating with an external system.   Do we have any mapping activities or any easy way to map between source and target objects or transformation logic during mapping? (Example: XSLT mapping).   I am managing by using Custom Java action for now. I just want to check for an better way?         
1 answers

Something like import mappings: ?


This example shows a mapping used in combination with the external database connector: the sql query generates a nested json structure, this is mapped to multiple persistent mendix entities using an import mapping: