The nice thing about fwcloud ui is the reuse of object and the general (centeral) interface. I think it would be nice if it can be used to generate firewall configuration for unsupported systems by using a template engine or so. In combination with a custom install script it would be possible to use the UI for any firewall system u can generate a config for. For example ansible could be used to deploy firewall configurations on windows [1], firewalld [2] or ufw [3].
[1] https://docs.ansible.com/ansible/latest/collections/community/windows/win_firewall_rule_module.html
[2] https://docs.ansible.com/ansible/latest/collections/ansible/posix/firewalld_module.html
[3] https://docs.ansible.com/ansible/latest/collections/community/general/ufw_module.html
[1] https://docs.ansible.com/ansible/latest/collections/community/windows/win_firewall_rule_module.html
[2] https://docs.ansible.com/ansible/latest/collections/ansible/posix/firewalld_module.html
[3] https://docs.ansible.com/ansible/latest/collections/community/general/ufw_module.html