Registering template with nested payload

**Query/Question**

In Android(FCM v1)/APN, How is it possible to register with a nested template? for example, I want the notification I send have some other properties in nested form, i.e

`
{
"message": "Simple notification message"
"object1":{
"prop1": "value 1",
"prop2": "value 2"
}
`
For Android, I have:

`String templateBody =
"{\"message\":{\"android\":{\"data\":{\"message\":\"$(message)\",\"object1\":{\"prop1\":\"$(prop1)\", \"prop2\":\"$(prop2)\"}}}}}";
`
it gets registered, but not receive notifications when I do send JSON body notifications with REST API in Postman like this:

`
{
"message": "Simple notification message",
"object1": {
"prop1": "value 1",
"prop2": "value 2"
}
}
`

If I don't use nested objects after message and just use a property, I'll work fine.
What could go wrong here?

The issue mentions the Android template body and REST API request but names no repository files, tests, or entry points. Start by locating the template registration and nested-payload handling, then reproduce the FCM/APN request to determine whether nested properties are supported and what successful delivery should look like.

Written by the indexing model from the issue text.