Proxy with Capacitor without server [Angular]

Capacitor
1

Is it possible to build a capacitor app with a specific proxy file?

Until now I use inside capacitor.config.json

server: {
    url: 'https://my-domain.com',
    allowNavigation: ["some.stuffs.com"],
}

but if my-domain.com is down my mobile app will not show anything. So I’m searching a way to have my app completely on mobile device and seems work if I remove server from capacitor configuration

Here the problem: If my app pointing to my-domain.com (started on a server with specific proxy-conf) all works well, but if I remove server from capacitor configuration capacitor doesn’t start my app with proxy conf and my http request not working well

Is there a way to obtain request proxed correctly on my capacitor app without using server conf in capacitor.config?