Updates allows you to import podcasts from any app that can export or share them in OPML format. You can also import podcasts from Apple Podcasts using a Shortcut.
To import podcasts from another app, go to Settings > Import Podcasts. There, you'll find step-by-step instructions based on the podcast apps installed on your iOS device.
If you're importing a large number of podcasts, the process may take some time, but you can continue using the app as usual. If any imports fail, Updates will attempt to retry later. You can also choose to skip failed imports if needed.
Note: When importing from Apple Podcasts, you must allow the Shortcut to access your podcast library; otherwise, the import will fail.