How to set Bakground Color of QLabel while preserve the border-radius style

[lautreamont]

I want to set the background color fade animation for QLabel
Here is my code

#ifndef MYLABEL_H
#define MYLABEL_H
#include <QLabel>
#include <QColor>
#include <QPropertyAnimation>
class MyLabel : public QLabel
{
    Q_OBJECT
    Q_PROPERTY(QColor color READ getColor WRITE setColor)
public:
    MyLabel(QWidget *parent = nullptr);
    void setColor(QColor color);
    QColor getColor();

protected:
    virtual void enterEvent(QEvent *event);

private:
    QPropertyAnimation *animation = nullptr;
};

#endif // MYLABEL_H

#include "mylabel.h"
#include <QEasingCurve>
#include <QPalette>

MyLabel::MyLabel(QWidget *parent)
        :QLabel(parent)
{
    animation = new QPropertyAnimation(this, "color");
    animation->setDuration(1000);
    animation->setStartValue(QColor(0, 0, 0));
    animation->setEndValue(QColor(240, 240, 240));
    animation->setEasingCurve(QEasingCurve::BezierSpline);
}

void MyLabel::setColor(QColor color)
{
    this->setAutoFillBackground(true);
    QPalette pal(this->palette());
    pal.setColor(QPalette::Window, color);
    this->setPalette(pal);
}

QColor MyLabel::getColor()
{
    return Qt::black;
}

void MyLabel::enterEvent(QEvent *)
{
    animation->start();
}

However, if I set the border-radius, the QPalette will still fill the corner

Alternatively, if I just use the function setStyleSheet

void MyLabel::setColor(QColor color)
{
setStyleSheet(QString("background-color: rgb(%1, %2, %3);border-width:2px;border-style:solid;border-radius:10px;border-color:gray;").arg(color.red()).arg(color.green()).arg(color.blue()));
}

It will work well. But this method looks stupid.
Is there any way let the first method work well?