How to manage GlobalVariable directly in HTTP body of a POST request

How is possible to pass the GlobalVariable directly in the HTTP body of a POST request ?

I’ve tried with:

{
“batch_code”: “MC01”,
“name”: “OMR-150-50-MC”,
“planned_start_dt”: “2019-05-14T22:05:00.000Z”,
“planned_end_dt”: “2019-05-15T07:35:00.000Z”,
“real_start_dt”: “2019-05-14T22:05:00.000Z”,
“real_end_dt”: “2019-05-15T07:35:00.000Z”,
“status”: “ONGOING”,
“unit”: {
“id”: ${GlobalVariable.unit_id},
“name”: “steril-3”
},
“recipe”: {
“id”: ${GlobalVariable.recipe_id},
“version”: 1
}
}

and also with :

{
“batch_code”: “MC01”,
“name”: “OMR-150-50-MC”,
“planned_start_dt”: “2019-05-14T22:05:00.000Z”,
“planned_end_dt”: “2019-05-15T07:35:00.000Z”,
“real_start_dt”: “2019-05-14T22:05:00.000Z”,
“real_end_dt”: “2019-05-15T07:35:00.000Z”,
“status”: “ONGOING”,
“unit”: {
“id”: “${GlobalVariable.unit_id}”,
“name”: “steril-3”
},
“recipe”: {
“id”: “${GlobalVariable.recipe_id}”,
“version”: 1
}
}

but variables are not replaced with the values.

I SOLVED ! mistakenly used the globalvariables but passed the variables