How to use channels inside sync functions inside tokio runtime?

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Thanks for teaching, I think I have one more question:

If I use Handle::current and Handle::spawn, is there a way to join these tasks after complete? In my current codebase, I'm using TaskTracker to spawn async tasks, so these tasks will be automatically be joined.

After I rewrite my code with TaskTracker, instead of using Handle::current and Handle::spawn APIs (sorry I didn't follow your instructions yet, but I will try later) The cargo build is current, and there's a new error:

thread 'main' panicked at src\js\binding\global.rs:76:34:
`spawn_local` called from outside of a `task::LocalSet`
stack backtrace:

Why I prefer using TaskTracker? Because in a previous topic (How to share tokio JoinSet across different tasks/threads? - #3 by alice), I learned this skill from another expert, hope I didn't misunderstand it, please correct me if I'm wrong.

Thanks