Do you mean like this?
sys-net ↔ sys-firewall ↔ sys-vpn ↔ sys-whonix ↔ anon-whonix
In this case the anon-whonix will go through Tor connection in sys-whonix and Tor connection in sys-whonix will go through VPN in sys-vpn so in sys-firewall it’ll be seen as just VPN connection.
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