GrapesJS & NetlifyCMS

Hi, I've been testing NetlifyCMS lately and I really like it, it has git workfow under the hood, it is under active development and has a great community around it. By default it is using superfast Hugo site generator, but it is generator-agnostic, so it can be used also with other site generators. I would like to use grapesjs as frontend editor (netlifycms has markdown editor). As far as I can see there is no real chance to do this, as NetlifyCMS has quite small possibilities for customization. I would like to know if someone here maybe tried to do this before or has idea how to use GrapesJS & NetlifyCMS together. Any hint much appreciated. Sorry for using Issues as help system, please activate gitter :)