I'm the one behind pot, a framework to manage jails as containers. Here, there is the presentation on how to orchestrate jail using nomad, from Hashicorp: https://archive.fosdem.org/2020/schedule/event/orchestrating...

pot is nothing more than a Proof of Concept, a model that uses FreeBSD technologies to implements a typical container workflow: jail, ZFS, pf, rctl and cpuset.

There is no compatibility to OCI standards, but I believe it would be possible to implement them.

There's also Bastille, which looks very interesting: https://bastillebsd.org/