streaming – Webpage as a stream overlay using ffmpeg

probably this is a dumb question but I have’t found anything talking about a way to display as overlay an active webpage.

I use to stream rtmp from my mobilephone to ossrs server wich used ffmpeg to encode or transcode those streams. I’m in need to overlay those streams with a dynamic html 5 page wich displays a scorebug and some dynamic panels with match data. The page is dynamic and data are loaded using an other web page as a match console.

Is here someone that can address me? Any chanche that the ffmpeg overlay filter will be able to render a web page with the js engine loaded?

Thank you very much
Filippo

PS: I know the power of OBS Browser Source but I cannot carry on a laptop to the gym!