Storyline's Text to Speech audio

Is it going to be possible at any point to control the speed of the voice-over audio?  I've seen a few older conversations around this but no updates that I found and I definitely NEED this feature in Storyline.  I've tried to wrap my head around Adobe Audition and it seems a bit complicated for an absolute beginner and bizarrely I don't seem to be able to download Audacity so pretty much stuck with manually adding in spacing to slowing down every. single. slide. in the project.......unless someone can suggest an easier way?

Is it possible to add code in the text to speech window to add emphasis to a specific word?