Set key for an object when import

The fields “key”, “filename” were assigned in column configuration, but when importing Pimcore always takes the CSV import row number as key and filename. How do I set this successfully?
Example: CSV field value “product01” in row 2, set to “key” in column configuration, CSV row 1 are headlines, so when importing the key is set to “1”. I want that the key to be “product01”
Version: Pimcore 5.8.0

Thx in advance