How to define CCA array sub-properties?

Hello Community,

I would like to define a custom JET component and define an array of object-properties as a sub-property of this component. Example data:

{
     columns: [
          {id: 1, description: "First column"},
          {id: 2, description: "Second column"},
     ]
}

I'm having trouble translating this into the component.json format. The following does not seem to work:

{
     ...
     "properties": {
          "columns": {
               "type": "Array",
               "properties": {
                    "id": {...}
                    "description": {...}
               }
          }
     }
     ...
}

I've also tried wrapping everything in the array in a "value" property:

{
     ...
     "properties": {
          "columns": {
               "type": "Array",
               "properties": {
                    "value": {
                         "type": "Object",
                         "properties": {
                              "id": {...}
                              "description": {...}
                         }
                    }
               }
          }
     }
     ...
}

Any way I can define this structure compliant with the OJET metadata definitions? https://www.oracle.com/webfolder/technetwork/jet/jsdocs/MetadataTypes.html#ComponentMetadataProperties  does not seem to cover this case in depth.

Any help would be much appreciated.

Kind Regards,

Philip

P.S.: I'm running JET 8.0.0.