Minikube custom systemd-networkd config files are deleted after restart

I am running minkube (1.11.0) using virtualbox. I am connecting to this instance using another virtual machine using a custom virtualnox internal network. I use VBoxManage to add the network to minikube.

I then copy a file to /etc/systemd/network/ and restart systemd-networkd.

However after restart minikube (using stop/start), my file is removed.

Is there a way to retain this file?

EDIT: i tried using chattr, but user_xattr is not enabled