Nothing so far on StackOverflow.
However, I got it to work using the following configuration:
<Virtualhost *:80>
    ServerName streamlit.group.pt
    ServerAlias server.pt

    documentroot /var/www/example.com/html/streamlit_reports/

    RewriteEngine On
    RewriteCond %{HTTP:Upgrade} =websocket
    RewriteRule /streamlit_report_name ws://streamlit.group.pt:8502 [R]

    RewriteCond %{HTTP:Upgrade} !=websocket
    RewriteRule /streamlit_report_name http://streamlit.group.pt:8502 [R]

    ProxyPassReverse /placeholder http://localhost:8502


The only problem so far, is that when opening the link streamlit.group.pt/streamlit_report_name the link automatically changes to streamlit.group.pt:8502, as I still haven’t managed to find a correct configuraton for this.
Hope it helps.