Can we create mapping of variables from json at runtime using c++

I have a json containing variables of different types, something like this

varlist: [{
           "name": "var_1",
           "type": "double",
           "value": 0.45
          },
          {
           "name": "var_2",
           "type": "int32_t",
           "value": 32
          }
         ]

is there any way, I can create variables by reading from json at runtime.

I thought of creating vector of different types, but there would be lot of different vectors. (just for storing value)

vector<uint8_t>   something_1;
vector<uint16_t>  something_2;
......  //all others

I have also tried creating struct, like:

enum type_enum{uint8_t, uint16_t, ......}

struct{
  std::string name;
  type_enum type;      
  union{
    uint8_t,
    uint16_t,
    .... 
  }mn;
}

I am using enum for accessing value from union, but for each time if i want some value from particular struct object, I am writing switch block for all available data types.

for e.g.

 //(for now i know that var1_value is of type uint32_t) but how to create it at runtime.  
 uint32_t var1_value = var1_struc.mn.(specific_value) //using switch block(with enum..)
 uint32_t var2_value = var2_struc.mn.(--------)

 uint32_t calc_value = var1_value + var2_value; 

I just wanted to know if there any better solution for achieving this (creating these variables from json at runtime) using c++.