Transform data from before to after

Input:
{
  "Before": "id,first_name,last_name,email,age 1,John,Doe,[email protected],30 2,Jane,Smith,[email protected],25 3,Emily,Jones,[email protected],22"
}

Output:
{
  "After": "{   \"users\": [     {       \"id\": 1,       \"name\": {         \"first\": \"John\",         \"last\": \"Doe\"       },       \"contact\": {         \"email\": \"[email protected]\"       },       \"age\": 30,       \"additional_info\": {         \"gender\": \"male\",         \"location\": \"New York\"       }     },     {       \"id\": 2,       \"name\": {         \"first\": \"Jane\",         \"last\": \"Smith\"       },       \"contact\": {         \"email\": \"[email protected]\"       },       \"age\": 25,       \"additional_info\": {         \"gender\": \"female\",         \"location\": \"Chicago\"       }     },     {       \"id\": 3,       \"name\": {         \"first\": \"Emily\",         \"last\": \"Jones\"       },       \"contact\": {         \"email\": \"[email protected]\"       },       \"age\": 22,       \"additional_info\": {         \"gender\": \"female\",         \"location\": \"San Francisco\"       }     }   ] }"
}