Add this code to your child theme functions.php file (you can read more about Child Themes here: https://support.vehica.com/knowledgebase/how-to-use-child-theme-how-to-change-files-php-css-js-and-keep-theme-future-update-compatibility/ )

add_filter('vehica/widgets', function ($widgets) {
    class CustomButtonSingleCarWidget extends \Vehica\Widgets\Car\Single\SingleCarWidget
    {
        const NAME = 'vehica_custom_button_single_car_widget';

        /**
         * @return string
         */
        public function get_title()
        {
            return 'Custom Button (VIN)';
        }

        protected function render()
        {
            parent::render();

            $car = $this->getCar();
            if (!$car) {
                return;
            }

            $field = vehicaApp('car_fields')->find(function ($field) {
                /* @var \Vehica\Model\Post\Field\Field */
                return $field->getId() === 6671;
            });

            if (!$field) {
                return;
            }

            $value = $field->getValue($car);
            if (empty($value)) {
                return;
            }

            ?>
            <a class="vehica-button" href="https://anydomain.com/?vin=<?php echo esc_attr( $value); ?>">Button TEXT</a>
            <?php
        }
    }

    $widgets[\Vehica\Widgets\WidgetCategory::CAR_SINGLE][] = CustomButtonSingleCarWidget::class;

    return $widgets;
});

 

Customize this code:

1. Custom Button (VIN) => Your name of a widget in the Elementor Sidebar

2. Button TEXT => Your Text on the button

3. 6671 => Text field ID (You can check text field ID, when you visit it via Vehica Panel in the URL e.g.

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Add it to your single listing template

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As you can see you will have a dynamic value in the URL

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