Dynamic Rule Loader - Docker Compose - Import Python lib

[DiegoMartelli]

Hi all,
I have a docker compose and one of the service is elastalert, I'm creating a custom rule loader, but I need to import pybars to elaborate the rule with handlebar.
What is the easiest way to do so? Maybe a configuration or an import?
Thank you

[DiegoMartelli]

I left a message for anybody with the same need. I just used jinja2 instead.