Window / Widget as VariantType for SimpleAction

How can I use Window reference as VariantType for SimpleAction?

For example:

SimpleAction::new("name", Some(&Window::static_variant_type()))

or there is simple types allowed only?
maybe the Value could help with that

You cannot put object instances inside a GVariant: it’s a wire serialisation format, and the only types it recognises are described in the GVariantType docs.

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