Yesterday something strange happened, two different people asked about this flexbox addition to Framer I was working on some weeks ago. So I've put the functionality into a module that will allow us to play with the flexbox layout in existing (and hopefully future) prototypes. You can grab the module from Github.
Also, to demonstrate its basic features, you can check the accordion menu example attached below, it takes less than 30 lines to code it.
Let me know your thoughts and questions, and take into account Flexer is still fragile, so handle with care! 🐣