How do I annotate an imported global?

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I have the following use case. There's a library that defines a global `vim.g` as `table`. In my application code, I want to utilise only the "autoformat" key of that table, i.e. `vim.g.autoformat`. I want to enforce this key as a `boolean?` but the language server marks it as `any`.

Is there any way I could achieve this?

No source file, test, or entry point is named. Start by reproducing the `vim.g.autoformat` annotation case described in the issue and trace how the language server types imported globals and table fields. Done should be a confirmed supported approach, with coverage or documentation showing how to enforce `autoformat` as `boolean?`.

Written by the indexing model from the issue text.