KeyValueFormat

{
    "position": {
        "horizontalAlignment": "HORIZONTAL_ALIGN_UNSPECIFIED"
    },
    "textFormat": {
        "bold": true,
        "fontFamily": "string",
        "fontSize": 0,
        "foregroundColor": {},
        "foregroundColorStyle": {
            "rgbColor": {},
            "themeColor": "THEME_COLOR_TYPE_UNSPECIFIED"
        },
        "italic": true,
        "link": {
            "uri": "string"
        },
        "strikethrough": true,
        "underline": true
    }
}