Julia variable assignment in `@pywith`

Is it (or should it) be possible to assign values to Julia variables within an `@pywith` block? For example,
```julia
julia> @pywith pybuiltin("open")("Manifest.toml", "r") as f begin
manifest = f.readlines()
end

julia> manifest
ERROR: UndefVarError: manifest not defined

```

Thanks!