Unable to identify Dictionary key type from resulting schema

[JustinDDavis]

Steps to produce my results:

1. I am using the https://json-everything.net/json-schema JSON Schema generator, with "Generate a Schema" option selected.
2. I provide the following example schema and run

   
   class Parent
   {
   public List<ChildDefinition> AllDefinitions {get; set;}
   }

class ChildDefinition { public Dictionary<string, ExtraInformation> Details {get; set;} }

class ExtraInformation { public string Detail1 {get; set;} public string Detail2 {get; set;} }

3. The results look like: 

{ "type": "object", "properties": { "AllDefinitions": { "type": "array", "items": { "type": "object", "properties": { "Details": { "type": "object", "additionalProperties": { "type": "object", "properties": { "Detail1": { "type": "string" }, "Detail2": { "type": "string" } } } } } } } } }

I would expect some way to identify the type of the key used with "Details".  
I went through what documentation I could to see if there is a callout to this type of situation, but I couldn't find anything myself. 

Thank you!