Install qemu and curl with homebrew:

brew install qemu curl

Write a script to download and install FreeBSD:

#!/bin/sh -
#
# dependencies: curl

VER="15.0"

TMPF=$(mktemp) || exit 1
trap "rm -f $TMPF" EXIT

curl -C - -O https://download.freebsd.org/releases/arm64/aarch64/ISO-IMAGES/$VER/FreeBSD-$VER-RELEASE-arm64-aarch64-mini-memstick.img
curl -o $TMPF https://download.freebsd.org/releases/arm64/aarch64/ISO-IMAGES/$VER/CHECKSUM.SHA512-FreeBSD-$VER-RELEASE-arm64-aarch64
pass=`shasum -c --ignore-missing $TMPF | awk '{ print $2 }'`
if [[ $pass == "OK" ]]; then
    qemu-img create -f qcow2 fbsd_aarch64.qcow2 16G
fi

qemu-system-aarch64 \
    -M virt \
    -cpu host \
    -accel hvf \
    -smp 4 \
    -m 4G \
    -nographic \
    -serial mon:stdio \
    -bios /opt/homebrew/share/qemu/edk2-aarch64-code.fd \
    -drive file=FreeBSD-$VER-RELEASE-arm64-aarch64-mini-memstick.img,format=raw,if=virtio,cache=writethrough \
    -drive file=fbsd_aarch64.qcow2,format=qcow2,if=virtio \
    -netdev user,id=mynet0,hostfwd=tcp::9022-:22 -device virtio-net,netdev=mynet0 \

rm $TMPF FreeBSD-$VER-RELEASE-arm64-aarch64-mini-memstick.img 

Execute the script and when the installation is done, shutdown the Virtual Machine.

Create a script to start the VM:

#!/bin/sh -
#
# ssh connection via port 7922

qemu-system-aarch64 \
    -M virt \
    -cpu host \
    -accel hvf \
    -smp 4 \
    -m 4096 \
    -nographic \
    -bios /opt/homebrew/share/qemu/edk2-aarch64-code.fd \
    -drive file=fbsd_aarch64.qcow2,format=qcow2,if=virtio \
    -netdev user,id=mynet0,hostfwd=tcp::7922-:22 -device virtio-net,netdev=mynet0 

Once started, connect with ssh:

ssh -p 7922 username@127.0.0.1