How to convert OVA to QCOW2 using QEMU

# Debian/Ubuntu
sudo apt install qemu-utils

# Arch
sudo pacman -S qemu

# RHEL/CentOS/Fedora
sudo dnf install qemu-img

$ VBoxManage list vms
"DB_Server" {9bf53784-16e9-40e7-b081-b7a87ff2f039}

$ VBoxManage export [VM_NAME] -o [OUTPUT_FILE].ova --ovf10

tar -xvf [OUTPUT_FILE].ova

qemu-img convert -f vmdk -O qcow2 [VM_NAME-DISK].vmdk [VM_NAME].qcow2