To add shipping options to your feed, follow these steps:
1. Open the app and navigate to Apps > Product Feeds > Feeds.
2. Select an existing feed or create a new one by clicking Add a new feed:
3. In the feed settings, go to the General tab and find the Shipping Options section and manually add all the necessary shipping options in this section:
After making your changes, click Save to save the feed settings.
4. Regenerate the feed for the changes to take effect:
Once this is done, your shipping options will appear in the feed file: