Trying to figure out how might use this docker image in firecracker properly

In trying to learn how to use firecracker with docker images I chose Docker as my test. I hoped it would give me a better idea how to use docker image in firecracker. I am able to get the vm to work and actually got the app to run in the container once I got int o the shell. BUt am stucke on next steps. I want to either mount my audio book folder over nfs or have it as separate persistent image that I can mount to add files to. Can anyone point me in the right direction on how I might go about doing this?
Thanks in advance