Pop request body field from pre-request script

I am sending a get request in the pre-request scripts to get a variable {{ind_id}} to include in the request body, however i want to remove that field in it’s entirety “individual_id”: “{{ind_id}}” if the variable i requested came back empty.
“post_as_individual”: {
“post_as”: {{$randomBoolean}},
“individual_id”: “{{ind_id}}”
},
Thank you