Thanks @thiago for the fast response! I’ll track the feature request 
I am still wondering about a temporary workaround. So far, I need to run a separate local python server to access the visualisation htmls (because of the browser’s same-origin policy). Would it be possible for me to copy the vis-htmls to the local streamlit folder, in order to access them from the same port as streamlit (8501 for instance)?
EDIT: Found the static html folder, I’ll just symlink my generated htmls inside it for the time being. It’s a bit of a sketchy workaround, but it’s okay for now! Being able to embed js in streamlit at some point would be awesome!