Get User Role Field in Woocommerce Product

functions.php

<?php

// Add meta box to Products post type
function add_product_user_role_meta_box() {
	add_meta_box(
		'product_user_role_meta_box',
		'User Role',
		'render_product_user_role_meta_box',
		'product',
		'side',
		'default'
	);
}
add_action( 'add_meta_boxes', 'add_product_user_role_meta_box' );

// Render meta box content
function render_product_user_role_meta_box( $post ) {
	// Retrieve the selected user role for the current product
	$selected_role = get_post_meta( $post->ID, '_product_user_role', true );

	// Get all user roles
	$roles = wp_roles()->get_names();

	// Output the select box
?>
<label for="product_user_role">Select User Role:</label>
<select name="product_user_role" id="product_user_role">
	<?php foreach ( $roles as $role_id => $role_name ) : ?>
	<option value="<?php echo esc_attr( $role_id ); ?>" <?php selected( $selected_role, $role_id ); ?>>
		<?php echo esc_html( $role_name ); ?>
	</option>
	<?php endforeach; ?>
</select>
<?php
}

// Save meta box data in Product
function save_product_user_role_meta_box( $post_id ) {
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
		return;
	}

	if ( isset( $_POST['product_user_role'] ) ) {
		$selected_role = sanitize_key( $_POST['product_user_role'] );
		update_post_meta( $post_id, '_product_user_role', $selected_role );
	}
}
add_action( 'save_post_product', 'save_product_user_role_meta_box' );