This is downloadable as .rpm or .deb for GNU/Linux. GhostBSD uses CentOS Linuxolator - not sure how to use it. They also offer a .pkg for Mac - could this be used to install it?
Update: Just tried following this guide:
https://wiki.freebsd.org/LinuxJails
and also tried Bastille without success:
https://bastillebsd.org/blog/2021/08/01 ... ontainers/