I made a video a while back showing what I do. This link starts at where I enter the track start times.

https://youtu.be/e6KRWp-zmMA?si=xHbUxpASCq6A5k6X&t=3469

The Split Kit allows you to import the valueTimeSplits into Sovereign Feeds. It also creates the chapters so you don't have to mess with json.

I use Sovereign Feeds and The Split Kit to build my RSS and valueTimeSplits.

https://sovereignfeeds.com

https://thesplitkit.com

After I finish my show I go back through the audio and put the start times into each track. The Split Kit handles the length of each track.