Is the Global Secrets File feature still supported?

I would like to add an instance-wide secret variable but I can’t find them anywhere in the docs(except for Global Secrets File which is in 0.8.0, is the feature still available now?

We have a lot of organizations and not want to set the secret organization by organization.

The 0.8 secret file is supported through a secrets extension. Please see the following extension repository and readme for installation instructions: