Put it to `/data/adb/service.d`

WSA-custom.sh

#!/system/bin/sh

# start after emulated storage is setup
while [ ! -d "/storage/emulated/0/Android" ]; do
  sleep 3
done

gethostip() {
  ip=$(ip route list match 0 table all scope global | cut -F3)
  if [ -z "$ip" ]; then
    return 1
  else
    echo $ip
  fi
}

while ! (gethostip); do
  sleep 3
done

settings put global http_proxy $(gethostip):7890
settings put global https_proxy $(gethostip):7890

settings put global window_animation_scale 1
settings put global transition_animation_scale 1
settings put global animator_duration_scale 1