Emulated Hue Call Service?

Hi All

Really new to home assistant but really loving it!

i have most things setup as i want but i would like to open plex on my WebOS TV, i can control my WebOS from the web interface by clicking the button etc

what i want it to tell alexa to turn on plex then it opens on my WebOS TV, this is possible from the web interface and i was hoping that emulated hue could trigger it?

When i click the button HA send this via the terminal

[homeassistant.core] Bus:Handling <Event call_service[L]: service_call_id=140067964216880-7, service_data=source=Plex, entity_id=media_player.living_room_tv, domain=media_player, service=select_source>

Can someone help?