Hello @Emmi, welcome to the forums !
This really looks nice at first glance and would be a very welcome addition to Streamlit ! The dev team is currently developing “Custom components” (see here) which enables the integration of HTML/JS plugins in Streamlit in a sort of “iframe” as you say.
If you have some documentation on how data is sent from Python to a JS/React component for display (that way we try to not send the full HTML into the component but only the relevant data that the component can work with) it will prove super useful to those who will want to try and build it !
Regards,
Fanilo