Test import without default asignee for component

Hi,

I'm usualy importing test cases from excel with empty asignee, because I want these test to have none filled after import.

However I had an issue recently when importing tests for component that has default asignee, that all imported tests are assigned to that default asignee for component.

I already tried to left asignee empty, fill it with "Unassigned" or "null" values but nothing pass through import.

Is there any other way than removing default asignee from the component that I can use? Eg. somehow specify that I want tests to be Unassigned (maybe specific accountId) in excel column for asignee?