Hello,
For this particular project, we will need your page access token from Facebook API as it's required for reading the fields of a live stream video. I can solve the problem with a single script of Javascript attached to the new page.
With the help of Graph API provided by Facebook, it's never been more convenient. By using the Live Video object, we can access the fields of a specific live stream video including `live_views` which is the viewer count of the live video.
If you want to work together, please contact me. Thanks!