如何更改qt quick controls2中工具提示的字体？

我想更改工具提示的字体系列，但出现以下错误

QQmlApplicationEngine未能加载组件

qrc:/main.qml:132类型书页不可用

qrc:/pages/BookPage.qml:41类型BookItem不可用

qrc:/pages/BookItem.qml:102无法分配给不存在的属性字体

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QML不支持有多个嵌套级别，因此通常会观察到这种类型的问题，适当减少它，如下所示：

ToolButton{
    id: tbtnStatistics

    ToolTip{
        visible: tbtnStatistics.down
        delay: Qt.styleHints.mousePressAndHoldInterval
        text: "This is Tooltip"
        font.family: "tahoma"
        timeout: 4000
    }

    contentItem: Image {
        fillMode: Image.Pad
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        source: "../images/statistics.png"
    }
}

ToolButton{
    id: tbtnStatistics

    ToolTip{
        visible: tbtnStatistics.down
        delay: Qt.styleHints.mousePressAndHoldInterval
        text: "This is Tooltip"
        font.family: "tahoma"
        timeout: 4000
    }

    contentItem: Image {
        fillMode: Image.Pad
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        source: "../images/statistics.png"
    }
}