Storyline 360 - Text to speech

I have used this product for a couple of courses that I created from power points.  I have a dozen or more course to complete.  All are generated by pulling in a power point with notes already created.  I know how to go into each slide and insert audio by using the text to speech functionality.  My question is - can a person insert "text to speech" for all the slides (80 -100 slides in total) at one time versus clicking through each slide to insert the audio?