Hey,
an essential feature for our team, in the long run, would be the possibility to add custom code, in order to add extended functionality to our prototypes (a la Framer).
Alternatively, and in the meantime, it would be a huge win to communicate between prototypes or generally with prototypes and their components, ideally via something versatile, like MQTT.
We do prototyping beyond mobile devices and regularly need to interface multiple screens, devices, and custom hardware (e.g. Microcontrollers). We do of course have other tools for that as well but since our designers primarily work in Figma, it would be really nice to close the gap between their click-dummies and our prototypes.