LG webOS Notifications w/icon: Problems

Configuration
21

I found it, thanks to this post.

service: webostv.command
data:
  entity_id: media_player.lg_tv
  command: system.notifications/createAlert
  payload:
    message: It is working!
    buttons:
     - label: "Launch Jellyfin"
       onclick: "luna://com.webos.service.applicationmanager/launch"
       params:
         id: "org.jellyfin.webos"
     - label: "Launch Retroarch"
       onclick: "luna://com.webos.service.applicationmanager/launch"
       params:
         id: "com.retroarch"
    iconUrl: /home/root/gas-mask-100x100.png

Maybe not right topic to ask, but I would like to know in short: How HA WebOS integration is communicating with TV. I mean, I would like to be able to send webostv.command from Postman or with Curl, if they communicating this way. Wouldn’t like to make off topic here, but if somebody could point me on some documentation with endpoints (I didn’t find anything) or simply answer short if they communicate differently and if this is not possible. Thx

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