Get Source Item info by Sku Using Multi-Source Inventory magento 2.

You can get source item details like Quantity, Status, Source item id, source code from the item Sku using Multi-source inventory (MSI) feature.

Useful Interface:
Magento\InventoryApi\Api\SourceItemRepositoryInterface

SourceItemRepositoryInterface used to find Source Items by SearchCriteria.

Code snippet to fetch source item details by SKU,

<?
namespace Jesadiya\SourceItemData\Model;

use Exception;
use Psr\Log\LoggerInterface;
use Magento\Framework\Api\SearchCriteriaBuilder;
use Magento\InventoryApi\Api\Data\SourceItemInterface;
use Magento\InventoryApi\Api\SourceItemRepositoryInterface;

class SourceItem
{
    /**
     * @var SearchCriteriaBuilder
     */
    private $searchCriteriaBuilder;

     /**
     * @var SourceItemRepositoryInterface
     */
    private $sourceItemRepository;

    /**
     * @var LoggerInterface
     */
    private $logger;

    public function __construct(
        SearchCriteriaBuilder $searchCriteriaBuilder,
        SourceItemRepositoryInterface $sourceItemRepository,
        LoggerInterface $logger
    ) {
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
        $this->sourceItemRepository = $sourceItemRepository;
        $this->logger = $logger;
    }

    /**
     * Retrieves links that are assigned to $stockId
     *
     * @param string $sku
     * @return SourceItemInterface[]
     */
    public function getSourceItemDetailBySKU(string $sku): array
    {
        $searchCriteria = $this->searchCriteriaBuilder
            ->addFilter(SourceItemInterface::SKU, '24-UB02')
            ->create();

        $result = $this->sourceItemRepository->getList($searchCriteria)->getItems();

        return $result;
    }
}

Call function to fetch data of source item,

$sku = '24-UB02';
$result = $this->getSourceItemDetailBySKU($sku);

foreach ($result as $item) {
    print_r($item->getData());
}

Output:

Array
(
    [source_item_id] => 7
    [source_code] => default
    [sku] => 24-UB02
    [quantity] => 98.0000
    [status] => 1
)

You can fetch the item source details information using the MSI inventory API module.