In case, there is working Chrome or Cordova app on the device or emulator and build a NativeScript app with tns run android, the following message will be print in the console.
Message
"chromium: [INFO:CONSOLE(25)] "No Content-Security-Policy meta tag found. Please add one when using the cordova-plugin-whitelist plugin.", source: file:///android_asset/www/plugins/cordova-plugin-whitelist/whitelist.js (25)"