postman-enter nested object in postman form data

    {
    "device_information":{
        "mobile":"iphone 8",
        "device_id":"12344"
    }
}

i need to enter this nested object as a feild in form data to use it along with a image upload feild can anyone say how to enter this data in postman form data.

i don't need array of objects inside the feild,i just need a single object inside the feild given

 "device_information": "{\"mobile\":\"iphone 8\,"\"device_id\":\"12344\"}"

this is the output i got insted of object