Support Pre-Order functionality for orders placed through external sales channels (e.g., Instagram, Facebook)

A merchant reported that some orders for out-of-stock items are being placed through external sales channels (such as Instagram), and these orders are not being marked as Pre-Orders. Currently, the Notify Me pre-order functionality only works when customers place orders through the online store using the Notify Me pre-order button. When customers purchase through other channels (e.g., Instagram, Facebook, or other Shopify sales channels), the order may still go through but will not be recognized as a pre-order. The merchant asked if there could be a way for the system to still apply the pre-order status even when the purchase originates from external channels, so orders for out-of-stock items are consistently marked as pre-orders regardless of where the purchase happens. Requested improvement: Allow the pre-order logic to apply to orders created through external sales channels, or provide a mechanism to ensure out-of-stock purchases from those channels are still tagged/processed as pre-orders. If this would be helpful for your store as well, please upvote this request!