Can I set additional environment variables in web-app

Does the DHIS2 Application Platform allow for importing additional environment variables? If I add a AAAA=1 to my .env file I cannot see it on a console.log(process.env).

Thanks to @tzemp I found out that DHIS2_APP_BLAH becomes REACT_APP_DHIS2_APP_BLAH. It is a good start.