integromat - How to get data out of multi-select and in json body integromat app

Question

I'm making a custom app and I have a couple of fields that are pulling data from an RPC and that all works fine but I can't get the data to map to a json body for that call.

My Mappable parameters are like this:

[
{
    "name": "candidate_id",
    "type": "number",
    "label": "Candidate ID",
    "required": true
},

{
   "name": "parent_id",
   "type": "select",
   "mode": "edit",
   "options": {
       "store": "rpc://industryID",
       "nested": [
           {
               "name": "ids",
               "type": "select",
               "label": "Sub Industry ID",
               "multiple": true,
               "options": "rpc://sunindustryId",
               "required": true
           }
       ]
   },
   "label": "Sub-Industry ID",
   "required": true
},
{
 "name": "body",
 "type": "json",
 "parent_id":"{{parameters.parent_id.value}}",
 "ids":"{{parameters.ids.value}}"
}
]

My call looks like this:

{
"url": "/api/v2/candidate/{{parameters.candidate_id}}/subindustries",
"method": "PUT",
"qs": {},
"body": "{{parameters.body}}",
"headers": {},
"response": {
    "output": "{{body}}"
}
}

The body of this call is meant to look like this: [ { "parent_id": 9999, "ids": [ 0 ] } ]