Chromebooks support a feature called Dictation, which allows you to type by speaking into the microphone. Turn it on using the following steps:

1. Open the app launcher (the circle icon in the bottom left), then find the Settings app:
   
    
2. Tap or click Accessibility on the left, then select Keyboard and text input:
   
   
    
3. Enable Dictation near the top of that screen:
   
   
    

Now you can talk to type in any text box by first clicking the microphone icon in the lower right (shown below) or by pressing 🔍 Search + D.