Variables at the server actions folder level

I hope I’m explaining this right, but I want to be able to use variables at the folder level:

Which I then can use in the underlying server actions, like {{folder_variable}}. For instance I want to store the username and password of the API I’m calling at the folder level, and then dynamically reference them in the server actions.

If it’s not possible at the folder level, maybe at a global level?

I got the idea from Postman:

It makes life a bit easier