geo: {
    label: {
        show: true,
        emphasis: {
            show: true,
            color: '#FF0000',
        },
        distance: 10,
        offset: [0, 10],
        rotate: 30,
        fontSize: 14,
        color: '#333',
        fontFamily: 'Arial',
        formatter: function (params) {
            return {
                rich: {
                    a: {
                        color: 'green',
                        fontSize: 16,
                        fontWeight: 'bold',
                        lineHeight: 30
                    },
                    b: {
                        color: 'red',
                        fontSize: 18,
                        lineHeight: 30,
                        backgroundColor: {
                            image: 'path/to/background.png'  // 背景图片路径
                        },
                        padding: [5, 5, 5, 5]  // 内边距
                    },
                    c: {
                        fontSize: 12,
                        lineHeight: 20
                    }
                },
                // 富文本模板
                text: '{a|' + params.name + '} - {b|Value: ' + params.value + '} - {c|Other Info}'
            };
        }
    }
}