In Windows 10, you can add and remove voice packages for a language for your device and apps. For example, text-to-speech (TTS) voices for Narrator.
Starting in Windows 10 build 18309, you can download additional voices in other languages without having to download language packs.
See also: Appendix A: Supported languages and voices | Windows Support
This tutorial will show you how to add and remove voice packages for a text-to-speech (TTS) language for all users in Windows 10.