JSON object with changing/different element names

Question

I'm having trouble transforming a JSON response from an API.

Basically their API returns me a JSON objects with this format:

{
   "data":{
      "id":1000000,
      "firstName":"John",
      "lastName":"Doe",
      "custom_186549":{
         "name":"Pension_overenskomst",
         "type":"Boolean",
         "value":false
      },
      "custom_186550":{
         "name":"Pension 1. arbejdsdag",
         "type":"Boolean",
         "value":false
      }
   }
}

Problem is that different employees will have different custom_XXXX names while they contain similar information.

In the picture you see custom_186549 contains information about "pension_overenskomst". But for another employee this might be inside custom_175134. I need to unify their format and get the sub fields of "pension_overenskomst" as the JSON object name and get rid of the custom elements.

I would like it to just say

{
   "data":{
      "id":1000000,
      "firstName":"John",
      "lastName":"Doe",
      "Pension_overenskomst":false,
      "Pension 1. arbejdsdag":false
   }
}

Regardless of what "custom" element it's inside.

Update: Managed to get the elements into an array. Now I just need to find a way to append them back into the JSON string.

var response = await httpClient.SendAsync(request);

var content = await response.Content.ReadAsStringAsync();

var responseObj = JsonConvert.DeserializeObject<dynamic>(content).data;

JObject names = JObject.Parse(content);

IEnumerable<JToken> CustomColumnsNames = names.SelectTokens("$.data.*.name");
IEnumerable<JToken> CustomColumnValues = names.SelectTokens("$.data.*.value");