Multiple lines for Google translate API (v2) and PHP (Symfony) requests problem

In my application, which uses Symfony and Google Translate API (v2), I have the following simple code:

$textArray = ["this is my text", "my text is amazing"];

$options = [
    'body' => [
        'q' => $textArray,
        'target' => $targetLocale,
        'format' => $format,
        'source' => $locale,
        'model' => 'base',
        'key' => $this->parameterBag->get('google_api_key')
    ],
    'headers' => [
        'ContentType' => 'application/json'
    ]
];
$response = $this->client->request(
    'POST',
    $this->parameterBag->get('google_translate_api.v2.translate_path'),
    $options
);

I use Symfony\Contracts\HttpClient\HttpClientInterface for the requests. So, the my $options are the following:

In response I get a 400 error. So, during debugging I found out that the problem is in the "q" - it expects a string, not array. The official documentation says that I should send the array of strings there if I have multiple sentences, at least I have such option. When I send them through Postman using the same "q" keys, everything works fine.

So, the question is: how should I modify my array of Qs in order to make it work?

So, the solution was actually is in using 'json instead of 'body' and the thing that we need to pass the key in 'query', not in 'json', separately.

$options = [
    'json' => [
        'q' => $textArray,
        'target' => $targetLocale,
        'format' => $format,
        'source' => $locale,
        'model' => 'base',
    ],
    'query' => [
        'key' => $this->parameterBag->get('google_api_key'),
    ]
];

this way we will have a possibility to send a proper array as array of Q strings.