POST from Form-data POSTMAN JSON

I'm trying to send json with postman with form-data because I have to send queues at the same time so I have to go through form-data instead of body.

Model d’exemple :

const PrSchema = new mongoose.Schema({ nom : String, user : { name : String } })

and the request post i use => user : req.body.user

Insertion applies but not the Json data

HELPP PLEASE

thanks