[Designer] unable to add vertical and horizontal spacing in factset

Problem Description

I would like to request an enhancement in Adaptive Cards that allows for greater control over the vertical and horizontal spacing between FactSet items. Currently, there seems to be a limitation in customizing the spacing, and this feature would greatly benefit developers and designers looking to achieve specific visual layouts and designs.

Card JSON

{
    "type": "AdaptiveCard",
    "body": [
        {
            "type": "TextBlock",
            "size": "Medium",
            "weight": "Bolder",
            "text": "${title}"
        },
        {
            "type": "ColumnSet",
            "columns": [
                {
                    "type": "Column",
                    "items": [
                        {
                            "type": "Image",
                            "style": "Person",
                            "url": "${creator.profileImage}",
                            "size": "Small"
                        }
                    ],
                    "width": "auto"
                },
                {
                    "type": "Column",
                    "items": [
                        {
                            "type": "TextBlock",
                            "weight": "Bolder",
                            "text": "${creator.name}",
                            "wrap": true
                        },
                        {
                            "type": "TextBlock",
                            "spacing": "None",
                            "text": "Created {{DATE(${createdUtc},SHORT)}}",
                            "isSubtle": true,
                            "wrap": true
                        }
                    ],
                    "width": "stretch"
                }
            ]
        },
        {
            "type": "TextBlock",
            "text": "${description}",
            "wrap": true
        },
        {
            "type": "FactSet",
            "facts": [
                {
                    "$data": "${properties}",
                    "title": "${key}:",
                    "value": "${value}"
                }
            ],
            "spacing": "None"
        }
    ],
    "actions": [
        {
            "type": "Action.ShowCard",
            "title": "Set due date",
            "card": {
                "type": "AdaptiveCard",
                "body": [
                    {
                        "type": "Input.Date",
                        "id": "dueDate"
                    },
                    {
                        "type": "Input.Text",
                        "id": "comment",
                        "placeholder": "Add a comment",
                        "isMultiline": true
                    }
                ],
                "actions": [
                    {
                        "type": "Action.Submit",
                        "title": "OK"
                    }
                ],
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json"
            }
        },
        {
            "type": "Action.OpenUrl",
            "title": "View",
            "url": "${viewUrl}"
        }
    ],
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
    "version": "1.6"
}

Screenshot

### Tasks

The issue provides a FactSet card JSON example but names no implementation files, entry points, or tests. Start by locating FactSet rendering and Designer layout handling, then clarify the supported platform scope; done means vertical and horizontal spacing can be configured for FactSet items and the behavior is demonstrated for the reported card.