add_filter( 'gform_pre_render_2', 'newchip_gform_pre_render' );
function newchip_gform_pre_render( $form ) {
	$form_id = $form['id'];	
    if ( empty( $_POST[ 'is_submit_' . $form_id ] ) && class_exists( 'WooCommerce' ) ) {
		$order_statuses = array('wc-on-hold', 'wc-processing', 'wc-completed');		
		$customer_user_id = get_current_user_id(); // current user ID here for example
		// Getting current customer orders
		$customer_orders = wc_get_orders( array(
			'meta_key' => '_customer_user',
			'meta_value' => $customer_user_id,
			'post_status' => $order_statuses,
			'numberposts' => 1
		) );
		
		foreach($customer_orders as $order ){

			// Order ID (added WooCommerce 3+ compatibility)
			$order_created_date = $order->get_date_created();			
			$order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;

			// Iterating through current orders items
			foreach($order->get_items() as $item_id => $item){
				$product_name = method_exists( $item, 'get_name' ) ? $item->get_name() : $item['name'];
			}
		} 
		foreach ( $form['fields'] as &$field ) {
			if ( $field->id == 6 ) {
				$field->defaultValue = $product_name;
			}
			if ( $field->id == 7 ) {
				$field->defaultValue = $order_created_date;
			}
		}
        
    } 
    return $form;
}