How to create dependencies in JSON Schema for nested properties pointing to parent properties

[russiann]

Say I have to create a form that results on this JSON.

{
  "propA": "text here", // string
  "propB": true, // bolean
  "propA": { // object
    "propA_A": "text here", // string
    "propA_B": { // object
      "propA_B_A": "this fild only appear if propB is true", // string
      "propA_B_B": "text here", // string
    },
  }
}

How can I make the propA_B_A dependency with propB?

I didn't get how I do this reading the docs (Schema Dependencies). It seems like there's no way to do a dependency with a parent field like this. But maybe I just didn't understand how.

Following the same idea, how can I do this same dependency with arrays?

{
  "propA": "text here", // string
  "propB": true, // bolean
  "propA": [{ // array of object <---
    "propA_A": "text here", // string
    "propA_B": { // object
      "propA_B_A": "this fild only appear if propB is true", // string
      "propA_B_B": "text here", // string
    },
  }]
}