Clarification on how to expose environment variables in a standalone Sanity Studio.

I'm having a hard time exposing a environment variable.
Following the
docs , env variables prefixed with

SANITY_STUDIO_

are exposed to Sanity CLI tool, development server and bundler.However, if I want to expose a new env variable to the browser, I
should not prefix it with

SANITY_STUDIO_

?

Is this in a standalone or embedded Studio?

Standalone.

Seems like I need to expose it prefixed...

Yep!