How to keep an item unique on single attribute in Redis JSON?

Question

I have a redis JSON collection and it must to store items unique.

[
  {
    "name": "John",
    "tId": 13,
    "phone": "124",
    "city":"LA"
  },
  {
    "name": "Jane",
    "tId": 14,
    "phone": "256",
    "city":"NYC"
  }
]

In this JSON, I want to keep name unique. The other attributes can be duplicate. However, all collection must only 1 item with name John or whatever.

What kind of index do that? Do I need to use RedisBloom?