Please find below code…

/*Custom data*/
$cart_item_data = array(‘inputurl’ => “data”);

/*Variation*/
$variation = array(‘attribute_pa_color’ => $color);

WC()->cart->add_to_cart( $product_id, $quntity, $variation_id, $variation , $cart_item_data );

/*Add custom data using filter hook wordpress*/
Put below code in functions.php

add_filter( ‘woocommerce_add_cart_item_data’,’add_cart_item_data’, 10, 3 );
function add_cart_item_data( $cart_item_meta, $product_id, $variation_id ) {
// function code
}