TextFormat

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