Documentation: Unclear how "World JSON" is supposed to work

My understanding is that "Upload World JSON" is kind of a shortcut to having an actual glTF; it allows passing in some JSON data (ideally basically a glTF file or subset thereof) and then operating on that data.

However, I can't seem to get it to work.

Here's the World JSON I tried to use:

```json
{
"materials": [
{
"doubleSided": true,
"name": "Box",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.800000011920929,
0.800000011920929,
0.800000011920929,
1
],
"roughnessFactor": 0.418181836605072
}
},
{
"doubleSided": true,
"name": "Numbers",
"pbrMetallicRoughness": {
"baseColorTexture": {
"extensions": {
"KHR_texture_transform": {
"offset": [
0,
0.9999999925494194
],
"scale": [
1,
0.10000000149011612
]
}
},
"index": 0
},
"metallicFactor": 0,
"roughnessFactor": 0.44090908765792847
}
}
]
}
```

and here's the graph:
```json
{
"nodes": [
{
"type": "pointer/get",
"values": [
{
"id": "index",
"value": [
1
],
"type": 1
}
],
"configuration": [
{
"id": "pointer",
"value": "/materials/{index}/pbrMetallicRoughness/baseColorTexture/extensions/KHR_texture_transform/offset"
}
],
"flows": [],
"metadata": {
"positionX": "-152.95025358469047",
"positionY": "-14.052485184163714"
}
},
{
"type": "event/onStart",
"values": [],
"configuration": [],
"flows": [
{
"id": "out",
"node": 2,
"socket": "in"
}
],
"metadata": {
"positionX": "-87.98506592492325",
"positionY": "285.35751182875754"
}
},
{
"type": "ADBE/output_console_node",
"values": [
{
"id": "message",
"node": 0,
"socket": "isValid"
}
],
"configuration": [],
"flows": [],
"metadata": {
"positionX": "234.9002222471646",
"positionY": "101.39403215244309"
}
}
],
"variables": [],
"customEvents": [],
"types": [
{
"signature": "bool"
},
{
"signature": "int"
},
{
"signature": "float"
},
{
"signature": "float2"
},
{
"signature": "float3"
},
{
"signature": "float4"
},
{
"signature": "float4x4"
},
{
"signature": "custom",
"extensions": {
"AMZN_interactivity_string": {}
}
}
]
}
```

My expectation is that this should log "true". Is that incorrect?

**EDIT:** After looking into the code, it seems like only `/nodes/99/scale, rotation, translation` is hardcoded for pointer access instead of using what's available in the world model.

Loading a GLB also doesn't seem to actually make it possible to access the JSON data inside; only specific properties are registered

No source files or tests are named. Start by reproducing the supplied World JSON and graph, then inspect pointer access and world-model property registration. Done means determining whether arbitrary World JSON paths are supported and documenting or correcting the observed limitation.

Written by the indexing model from the issue text.