I have a discussion about embedding builder into Electron here https://github.com/ipselon/react-ui-builder/issues/10

And I didn't get the answer on my question: how developer will work with this in Electron ?

Yup. I ended up ditching front end frameworks and just using Atom to build a desktop application. Atom has so many packages already it makes it just a matter of figuring out how to put everythung together,