Media player URL

Is there any way to get the complete URL of what a Chromecast is playing?

When I cast something I can see the app name, say tv4 and the number assigned to this show say 12345 or something.
The complete path that is needed to cast the episode is something like www.tv4play.se/the-name-and-sometimes-season/12345

And that is not something that I can get from the media_player in HA.
But is there anything in the Chromecast and/or Google’s services where this can be found?

My plan is to build something for shows that you didn’t finish seeing.
So let say you stoped half way then it should be added to the list and where it got stoped, but to be useful I need the URL.