custom-background-row.php

<?php
add_filter('wpt_table_row_attr', function($attr, $row_object){
	$product_id = $row_object->product_id;
	$color = get_post_meta($product_id, '_wpt_bg_color', true);
	// if( empty( $color ) ) return;

// 	$color = '#aabbcc';
	// return "data-color='$color_code'";
	return "style='background-color:$color;'";
},10, 2);
add_action('wp_head',function(){
?>
<style>
div.wpt-wrap table.wpt_product_table tbody tr.wpt_row>td {
    background-color: transparent !important;
}	
</style>
<?php
});