Can one pass file descriptors to QEMU through QMP/monitor after it has started?

[DUO Labs]

I'm trying to write an application that interacts with a running QEMU instance to create drives 
from shared memory. I'm on a macOS host, so I can't just do something like `/dev/shm/<id>`, 
or `/proc/<fd>/fd/<num>`. So, is there a way to send the fd to the QEMU instance? If 
it helps, the QMP socket is exposed as a UNIX socket.