How to use createNestedObject in a for loop?

Created by: probonopd

Sorry for bringing up one more question similar to #10 (closed), #57 (closed), #84 (closed) but this appears to be strange for beginners.

I am trying to generate

{  
   "lights":{  
      "1":{  
         "name":"Lamp 1"
      },
      "2":{  
         "name":"Lamp 2"
      },
...
      "999":{  
         "name":"Lamp 999"
      }
   }
}

using a function addLight(root, i) that I need to call for a dynamic number i of lights which is determined at runtime (in the above example, i is 1...999). Looking at https://arduinojson.org/doc/pitfalls/#6-do-not-assume-that-strings-are-copied I am pretty certain that what I am doing right now is entirely wrong (and the result is a crash) but I cannot quite figure out what I need to do instead.