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.