What are best ways to integrate templates for OKR, PM, Time-tracking?

Thanks a lot Al!
Yes to " the hierarchy you’re looking for from parent to child is Objective->KR->Feature->Milestone->Project->Task->Detailed task metrics, right?"

So, perhaps one way is to integrate multiple templates to create such a hierarchy? Or other creative ways to do it?

To create such a hierarchy, would you recommend which PM template is best to join into the Spotify OKR Template? Or maybe someone can share a PM doc with a deeper hierarchy than the current templates avail so far?

Also task dependencies is a useful feature to integrate for most Project Managers. Perhaps, one way is like in this template, unless someone can suggest anything better:

For Time Tracking, I’d probably do it in dedicated time tracking apps like TimeCamp and Clockify, which have tons of features & reports already built. And when a task marked complete in TimeCamp or any other PM saas, then a Coda row would be updated via a Zapier rule.
Either way, we’re looking to pick several PM saas synced via Zapier, in case one saas has outage or software bugs emerge.