If you are using a device that has dictation capabilities, then you can use speech/voice-to-text wherever you can type. Please utilize the video below for directions to enable dictation on iOS and Mac devices.

If you need additional documentation, please utilize this help article from Apple about enabling Dictation on a Mac.

Windows also has the capabilities to enable voice to text. Please utilize this help article from Microsoft to set it up on your computer. 

Android also has the capabilities to do speech to text. Read this article for details.