Automate deploying a bunch of thin jails

I'm setting up the *ARR suite apps in jails (using the Bastille manager). I used to do this in debian and docker but this time I moved to freeBSD to try out it's native zfs support. In setting up I need to setup a uniform user, setup external mounts (the involved bit) and install the apps on each jail. I did this manually on a trial system and it works perfectly (finally!). In docker this was all automated in the form of compose scripts. I write it up once and then don't need to worry about it when I reinstall/upgrade the host.. Is there any automation tool I can use in my case?