Change Melhor Envio shipping methods labels.

package-rates.php

<?php

function test_methods_array(){
    return [
        'wpmelhorenvio_Correios_PAC'      => 'Encomenda normal',
        'wpmelhorenvio_Correios_EXPRESSO' => 'Encomenda expressa',
        'wpmelhorenvio_JadLog_.Com'       => 'JadLog Bar',
        'wpmelhorenvio_JadLog_.Package'   => 'JadLog Foo',

    ];
}

add_filter('woocommerce_package_rates', function($rates, $package){

    $methods_map = test_methods_array();

    foreach ($rates as $key => $rate) {

        if(!in_array($key, array_keys($methods_map))) {
            continue;
        }

        $method_label = $methods_map[$key];

        $rate->set_label($method_label);
    }

    return $rates;

}, 10, 2);