Bad code will be unreadable in any language of course.
Yeah I'm talking about good code, or at least not bad code. Let's not "no true Scotsman" this.
Even for good code you don't need syntax highlighting to easily see which identifiers are function names and which are their parameters in Rust.
How "production" are we talking? Pretty bad idea if it's an important work server. "Sorry boss, nobody could connect today because VSCode's mojam.service hit one of its many many 100% CPU bugs".
I think in theory there's no reason it isn't technically possible, but I doubt it's set up to allow it because that's a pretty odd thing to want to do.
Edit: oh you want to access it via Android. That makes vaguely more sense.