Zephyr API Requirements „Imported” folder

Hi,
I am using request „External Requirement” to import USs from Jira. They appear under Imported folder. I would like to then use these requirements and map them to test cases. However, I am trying both requirement tree request or the advanced search request, with no luck. I am getting only requirements that are already there moved by user to release folder or project level folder. Am I missing something here? Or is there no way to get requirement tree id through api for the folders under Imported?