Save different attribute labels per store => unique id by admin label

Good morning Daniel,

referring to ApiImport / code / Model / Import / Entity / Product.php L. 128
we don't seem to have the possibility to import Attribute labels per store. Is that correct?
We currently have the case that only the admin label is unique while the attribute option labels for the frontend aren't. Do you see a simple solution to extend the logic at this point?
Ideally we'd pass on an array with the admin label as the primary key and storeId=>label as key values.
Does that make any sense or are we getting something wrong here?

Thank you in advance
Regards

Amir