It is possible to type with your voice, but only in the writing space and in forms for the question type:
text with special characters.
As a teacher, you enable speech-to-text either for a whole class when you set up the assignment or for a specific student by going to the three dots to the right of the student's name.
The student needs to add punctuation marks by him or herself. The program does not respond to voice commands like a full stop, copy etc...
This is what it looks like as a student: