Some podcast host do it for you, nostr:npub1yvgrrzf4dnmu30qfhw95x87ruu0g2kpv3a64h8hpvqsre8qeuspsgd6pv9's Sovereign Feeds let you do it or you can even do it in the ZeroNode IRC.

https://podcasting2.org/podcast-namespace/tags/podping

https://github.com/Podcastindex-org/podping