Create Wasm globals from C code?

I would like to define WebAssembly `global`s in C code, something like

```c
int __attribute__((wasm_global)) myGlobal = 5;
```

that would then emit a
```wast
(global $myGlobal i32 (i32.const 5))
```
into the build. Setting and reading the variable would then emit `global.get` and `global.set`, and taking an address `&myGlobal` would then be forbidden at compile time. Is there a way to do that today, or would it be possible to add?