Issues when attempting to use jpath

[ahi-el]

I have a JPath which I attempted to use with the following json:

{
  "typeName": "NamePart",
  "foundHits": true,
  "items": [
    {
      "id": "e2178906-7463-4e10-a2fb-fcefd8f0e2bb",
      "genericItems": [
        {
          "name": "String",
          "genericType": "FreeString",
          "value": {
            "StringValue": "SDF"
          },
          "behaviorOverrides": {}
        }
      ],
      "exclusions": [],
      "tags": null,
      "isActive": true,
      "createDate": "2023-09-13T14:29:44.902Z",
      "updateDate": "2023-09-13T14:29:44.902Z"
    },
    {
      "id": "b8d04158-b1da-4ca4-9825-e34c4b208f6c",
      "genericItems": [
        {
          "name": "String",
          "genericType": "FreeString",
          "value": {
            "StringValue": "INC"
          },
          "behaviorOverrides": {
            "StringValue": {
              "behavior": "STANDALONE",
              "additionalProperties": null
            }
          }
        }
      ],
      "exclusions": [],
      "tags": null,
      "isActive": true,
      "createDate": "2023-09-13T14:29:44.235Z",
      "updateDate": "2023-09-13T14:29:44.235Z"
    }
  ]
}

And I wanted to simplify it down to the next json:

[
  "SDF",
  "INC"
]

When I use https://jsonpath.com/ for finding the relevant JPath for me, I had several lines that worked
$.[items].[genericItems].[value].StringValue
$.items[].genericItems[].value.StringValue

but when I attempted to use it with the JsonCons library, I either got nothing, or the next error
'Expected unquoted string, or single or double quoted string, or index or '*''

What is the difference between https://jsonpath.com/ and the library? do they not use the same standard?

My code:

var json = JsonSerializer.Serialize(items.Items);
        var jsonArray = JsonDocument.Parse(json);
        var selected = JsonSelector.Select(jsonArray.RootElement, @jPath).ToList();
        return selected;