I already try setup nakama server on android ( > termux > qemu > docker)
and yes, some slow but it works
but many of my project use Websocket server which godot has.
projects has small network action and it's faster then design nakama server.
I know running app through apk will work well
but screen must be on (avoid sleep mode for polling), bettery usage so high
Here is idea,
1. running godot-server on termux. termux will work on background (as far as I know, there is no way to running godot app in background mode on android)
2. running godot-server on termux > qemu. it also can do background work
3. success compile godot engine for aarch64-server-godot (I tried and failed before)