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magento 2 how to get children product sku or children product id using parent product id or sku

how to get children product SKU or children product id using parent product id or SKU
I have these details for particular options, here are 2 arrays and I need particular product id or sku

 Array
    (
        [0] => Array
            (
                [value_index] => 5438
                [label] => Black
                [product_super_attribute_id] => 531
                [default_label] => Black
                [store_label] => Black
                [use_default_value] => 1
            )
    
        [1] => Array
            (
                [value_index] => 5907
                [label] => Silver
                [product_super_attribute_id] => 531
                [default_label] => Silver
                [store_label] => Silver
                [use_default_value] => 1
            )
    
    )

Note: I am using AMP so can not use Jquery