It's really a fantastic tool, we are using it since several months in replacement of figma and Adobe XD. The prototype feature is working great as well.
It seems like no :( I'm a big fan of the auto layout feature in Figma and Framer, in fact I've started getting the designers at my workplace to use it in lieu of fixed pixel values. Would love to switch to a FOSS solution, but that one missing feature is a blocker for me, for now.