1 Product 2 Stock Locations

Hello,
I am trying to figure it out how to import stock quantity to product inventory. I have one product with 2 locations with Simple Multi-Inventory For Woocommerce and WP All Import

In Taxonomies, Categories, Tags tab i get to config it, but WPAI imports stock as locations

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And in XML file its just simple:

<stocks>
<stock_a>72</stock_a>
<stock_b>0</stock_b>
</stocks>

Any ideas how to make it work? Maybe its possible with advanced custom fields?