JSON syntax for iOS push with subtitle

Mobile Apps Home Assistant Companion for Apple
1

I’m trying to get subtitles into my automations. Here’s the JSON syntax I’m trying to use:

{  
   "message":"test notification.",
   "data":{  
      "subtitle":"subtitle."
   }
}

…but when I trigger it, I don’t get a subtitle. What am I doing wrong?

2

I think I answered my own question:

{
  "message": "this is the subtitle",
  "title": "this is the title"
}