New feature: ability to use variables/secrets in the additional configuration files

[gwarf]

The feature from https://github.com/moghtech/komodo/releases/tag/v1.19.1 allowing to edit additional configuration files work great, would it be possible to also use secrets/variable for these files, as these files tend to contain secrets?
I'm using a Git repo (Forgejo), and the changes are committed to the git repo, and if we can get the support for using Komodo the secrets should ideally be kept out of the git repo, so maybe only committing it as [[THE_SECRET_FROM_KOMODO]].