Looks like they have added a builder for tokio::task[1] that will allow you to set a name. It's unstable at the moment so you would need to set the tokio_unstable cfg flag.
[1]: https://github.com/tokio-rs/tokio/blob/master/tokio/src/task...
[1]: https://github.com/tokio-rs/tokio/blob/master/tokio/src/task...
I expect the new APIs like the task builder will stabilize (no longer require the `tokio_unstable` flag) over the course of 2022.