While QEMU will probably support mounting directories with a macOS host starting with 7.0 (due out in a few months – see qemu: add 9p virtfs support on Darwin by mroi · Pull Request #122420 · NixOS/nixpkgs · GitHub for the extended process to get to that point), qemu: backport 9p-darwin to v6.2.0 by willcohen · Pull Request #162243 · NixOS/nixpkgs · GitHub is a PR that backports that functionality back to 6.2.