How to add a date query parameter for a resource not based on entity?

I have a GET endpoint that is not related to any entity. The endpoint returns the European VAT rate for a given date. I need to add a parameter named date with the type date (which should return a \DateTime object, for example).

I've successfully added other types of parameters but I'm struggling with this:

#[ApiResource(
    shortName: 'VAT',
    routePrefix: 'EU-vat',
    operations: [
        new Get(
            name: 'vat_get',
            uriTemplate: '/get-rate/{country_code}',
            uriVariables: [
                'country_code' => new Link(
                    description: 'ISO 3166-1 alpha-2 country code',
                    schema: [
                        'type' => 'string',
                        'example' => 'IT',
                    ],
                ),
            ],
            parameters: [
                // Add the date parameter
            ],
            output: GetVatRateResult::class,
            provider: VatStateProvider::class,
        ),
    ],
)]
class Vat
{
}

Adding a simple QueryParameter and specify date as schema doesn't work:

parameters: [
    'date' => new QueryParameter(
        description: 'The date for which to retrieve the VAT rate',
        schema: [
            'type' => 'date',
        ],
    ),
],

The documentation lists the type as any, so it isn't recognized and the widget is rendered as a plain text field: