Anyone? I would really appreciate any help here 
At least maybe someone can tell me how I can modify android manifest.xml file with the help of UPL to add custom network secutre condig, like google documentation says?
<?xml version="1.0" encoding="utf-8"?>
<manifest ... >
<application android:networkSecurityConfig="@xml/network_security_config" ... >
...
</application>
</manifest>