Is your feature request related to a problem? Please describe.
I need env variables to have dev and prod env and reduce variables reuse

Describe the solution you'd like
I realy want to use env variables to set it in my data sources/applications/modules/queryes and etc
like host = "examle.com" in query this look like http://{{env.host}} or same
And I think be very nice if some can set key:value to environment in docker
Describe alternatives you've considered
If this feature be possible to use only in some places
With Docker this is not much needed

Additional context
I be very happy if it possible