Is there a way to have additional config-specific environment variables? Ideally I'd just add my own stuff to the existing config files

not in the Metaflow’s config file but you could use .env files https://outerbounds.com/docs/set-env-vars-with-file/

hmm yea I think I can get by with

IncludeFile

and extra environment variable.. something like:

METAFLOW_PROFILE=xxx METAFLOW_ENV_FILE=xxx_env python flow.py