AngularJS bind to dynamic model name

I have a generic JSON structure like this

{
 "parameters":
              [
                {
                  "key":"fieldName","posibleValues":["Val1,"Val2"],
                  "key":"anotherField","posibleValues":["ValA,"ValB"]
                }
              ]
 }

No I want to do something like this:

<div ng-repeat="parameter in parameters">
  <ng-form name="paramForm">
    {{parameter.key}}: <select ng-model="request.parameter.{parameter.key}" ng-option="..." />    
  </ng-form>


</div>

The problems comes with the

select ng-model="request.parameter.{parameter.key}"

So I want to setup a model that is named like "request.parameter.fieldName" (according to the "key" in the JSON structure.

Is this possible? Or do I have to help myself with a ng-change?

Thanks