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default option as select a product from list option in product variation

I want to at a — select a product from list — option in product list page using commerce module. using product list view.Added the code as below but it through an error

file location: /code/modules/contrib/commerce/modules/product/src/Plugin/Field/FieldWidget/ProductVariationTitleWidget.php

$element['variation'] = [   '#type' => 'select',   // Widget settings can't be translated in D8 yet, t() is a workaround.   '#title' => $this->t($this->getSetting('label_text')),   '#options' => array_merge(array("--- Please select a product ---"), $variation_options),   '#required' => TRUE,   '#default_value' => !empty($selected_variation) ? $selected_variation->id() : '',   '#ajax' => [     'callback' => [get_class($this), 'ajaxRefresh'],     'wrapper' => $form['#wrapper_id'],   ], ];
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default option as select a product from list option in product variation

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