Heirarchy of variables - using host vars in module vars

[emmetog]

I like the simplicity of this tool a lot! Thanks for putting it together.

I've been trying to build a PoC and run into a problem: I can't figure out how to have module variables that may contain host variables. For example:

# In the module variables file
deploy_to_path="/var/www/${project}-${instance}-${env}"

where some of those variables are defined in the host vars.

Is it possible to build hierarchies of variables like this?