Y'all just reinventing the wheel? Templates for any Podcasting 2.0 spec can be copy and pasted from the GitHub. It's RSS, a protocol. It's open and free. Just search "valueTimeSplit" on this page and learn all about it...along with all the other magical tags you can implement.
Link: 
GitHub
podcast-namespace/docs/1.0.md at main ยท Podcastindex-org/podcast-namespace
A wholistic rss namespace for podcasting. Contribute to Podcastindex-org/podcast-namespace development by creating an account on GitHub.