The team is now working on the WordPress Interactivity API. This unblocks the same UX Frontity framework enabled but directly in WordPress Core, fully compatible with the new Site Editor.
Right now you have to install it in node_modules and then move it to the packages folder and change package.json manually. That work should be done automatically by a new command.
User stories
As a Frontity developer,
I want to install local packages with a command,
so that I can easily work with local packages in my project.