Example of using Sync Send on vTable

[Bengreen]

Is your feature request related to a problem? Please describe.

I am creating an FFI library where I want to pass in a number of thing_trait_objects. I then store these into an object and this object is used within a web service (ie Warp inside Tokio). For this to work the object I pass in needs to be Sync + Send. Sync + Send depend upon the enclosed objects. In particular the vTable is giving me the error NonNull<HealthProbeFuncsVtable> cannot be sent between threads safely`
How can I enable the vTable to be Safe + Sync

Describe the solution you'd like

An example of how to add Sync + Send to the vTable. And some discussion on risks or why/why not.

Describe alternatives you've considered

I don't really see an alternative on having Sync + Send available. I was wondering if I can explicitly add this and unsure if that is sensible/safe.

Additional context

Not that I can think at moment.