how to store a collection of string as key and json as value in c++

I am trying to store a collection of key-value pair in cpp, where key will be a string, as will the value - in my case, a JSON string representing an object.

Then I need to access this json object using Key1 For Example

Key1 = name1 Value1 = {name:"Anil Gautam","age":25}

Key2 = name2 Value2 = **strong text** = {name:"Sharan Gupta","age":26}

I want to access

{name:"Anil Gautam","age":25} 

when I input "name1". What Can I possible do to store this kind of data in cpp.