@acarson @weirdwriter The post about and link to the Shortcut: https://haroldgao.com/post/opml/

NB. If you tap the ellipsis on the icon before adding it, you can review the Shortcut code.

Edit: just noticed the same person has an Import OPML into Apple Podcasts shortcut on the same page as well, in case you need to go back.

How to Import Your Apple Podcast Subscription List into Other Podcast Apps