Is there a way to make a JobHandle?

I love that the ReadHandles returned by AsyncReadManager.Read contain a JobHandle. This lets me chain data-processing jobs onto loads trivially.

I have other tasks outside of the job system where I would like to use a JobHandles so that jobs can depend on those tasks.

Has anyone seen a way to do this?

Cheers

p.s. I am aware that we can run managed code in non-burst jobs, I use this in parts of my project. In this case I'm specifically interested in use JobHandle to signal from other systems