sync stock variations have different values for sku and stock

Hi,

Trying to sync all stock and doing it this way:
https://www.wpallimport.com/documentation/syncing-stock/

But for me this does not work. As all my variations have a different sku value and stock value.
simple products have:
{variants[1]/variant[1]/sku[1]}
{variants[1]/variant[1]/stock_level[1]}

variations have:
first variation:
{variants[1]/variant[1]/sku[1]}
{variants[1]/variant[1]/stock_level[1]}
second variation:
{variants[1]/variant[2]/sku[1]}
{variants[1]/variant[2]/stock_level[1]}
third variation:
{variants[1]/variant[3]/sku[1]}
{variants[1]/variant[3]/stock_level[1]}

and so on. how to update them all? because when choosing {variants[1]/variant[1]/sku[1]}
{variants[1]/variant[1]/stock_level[1]}
it only updates simple products and the first variation of a variable product.

Thanks in advance