Is it possible to configure the Content Delivery API so that nested block information is returned? The documentation regarding the subject is rather diffuse, but to my understanding this should be achievable by ovveriding the Filter method in ContentApiModelFilter<ContentApiModel>. So far I've managed to remove null-values from the response but I have no idea on how to expand nested blocks in the response.

Basically, I want to expand the block information of answerOptions so that the API returns its properties:

{
    "contentLink": {
        "id": 12,
        "workId": 0,
        "guidValue": "fa94ca3f-6ba1-4d93-bfba-66556164f3ed",
        "url": "https://localhost:5000/en/package2/"
    },
    "name": "package2",
    "contentType": [
        "Page",
        "PackagePage"
    ],
    "url": "https://localhost:5000/en/package2/",
    "frames": {
        "expandedValue": [
            {
                "contentLink": {
                    "id": 1014,
                    "workId": 0,
                    "guidValue": "343f3bcf-2204-471b-847f-93bc910f9571"
                },
                "name": "pollblock",
                "contentType": [
                    "Block",
                    "PollBlock"
                ],
                "question": {
                    "value": "is this a question?",
                    "propertyDataType": "PropertyLongString"
                },
                "answerOptions": {
                    "value": [
                        {
                            "displayOption": "",
                            "contentLink": {
                                "id": 1012,
                                "workId": 0,
                                "guidValue": "4a4e1407-f1ff-427f-bf33-e84286774ba7"
                            }
                        },
                        {
                            "displayOption": "",
                            "contentLink": {
                                "id": 1013,
                                "workId": 0,
                                "guidValue": "35e1b241-2052-4300-bdaf-f5da72dabf7a"
                            }
                        }
                    ],
                    "propertyDataType": "PropertyContentArea"
                }
            },
            {
                "contentLink": {
                    "id": 14,
                    "workId": 0,
                    "guidValue": "d1cac50a-1bb9-46d1-85fb-3caeb6fa0c52"
                },
                "name": "endframe2",
                "contentType": [
                    "Block",
                    "EndFrameBlock"
                ],
                "text": {
                    "value": "test",
                    "propertyDataType": "PropertyLongString"
                }
            }
        ],
        "value": [
            {
                "displayOption": "",
                "contentLink": {
                    "id": 1014,
                    "workId": 0,
                    "guidValue": "343f3bcf-2204-471b-847f-93bc910f9571"
                }
            },
            {
                "displayOption": "",
                "contentLink": {
                    "id": 14,
                    "workId": 0,
                    "guidValue": "d1cac50a-1bb9-46d1-85fb-3caeb6fa0c52"
                }
            }
        ],
        "propertyDataType": "PropertyContentArea"
    },
    "categories": {
        "value": [
            {
                "displayOption": "",
                "contentLink": {
                    "id": 11,
                    "workId": 0,
                    "guidValue": "c919c611-7833-4953-b690-d2c6097fb642"
                }
            }
        ],
        "propertyDataType": "PropertyContentArea"
    }
}