As somebody who spends a lot of time in Jupyter, I might say this "lets your IDE work like a notebook." That's what it makes me think. Right now I go to Jupyter when I want to figure out what works interactively. This looks like it would let me do a lot of that from an IDE, which is probably where I want the code to go anyway. Maybe "Notebook interactivity in your IDE"? Or for people who don't use jupyter regularly maybe "interactively debug your code as you write it". Something like that would help me understand how cool this is without watching a screencast. It would get me to watch the screencast.
Or to put it another way: think about why users would be interested in it, not about how it works or what it does.