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: https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/1.0.md#value-time-split