In fact, I'm almost there!
With the code I get the ID, but not the name.
<?php
$inv = \AtumMultiInventory\Models\Inventory::get_order_item_inventories( $summary_item['item_id'] );
$inventory_id = $inv[0];
$inventory = \AtumMultiInventory\Inc\Helpers::get_inventory( $inventory_id->inventory_id );
$locations = $inventory->location;
$locations_lists = ! empty( $locations ) ? implode( ', ', $locations ) : '';
?><p style="font-size: 10px;"><?php echo esc_html( $locations_lists ) ?></p>
I did not find how to call the field with the name.
Even basing myself with: https://stockmanagementlabs.github.io/atum-rest-api-docs/#product-atum-locations-properties-atum
I just need a little help, I know you can do it <3