柱状图数据用dataset无法显示label

Question

配置如下：

option = {
    "dataset": {
        dimensions:['tjzb','cs'],
        "source": [
            {
                "cs": 142,
                "tjzb": "系统-日志-访问日志-模块统计",
                "id": "05405FB19362440DB7B6763DB18536F0",
                "rn": 1,
                "my-lbxz": "0"
            },
            {
                "cs": 114,
                "tjzb": "系统-数据管理-数据字段",
                "id": "SYS_SJGL_SJZD",
                "rn": 2,
                "my-lbxz": "0"
            },
            {
                "cs": 110,
                "tjzb": "系统-数据管理-数据对象",
                "id": "SYS_SJGL_SJDX",
                "rn": 3,
                "my-lbxz": "0"
            },
            {
                "cs": 72,
                "tjzb": "系统-日志-访问日志-访问量统计",
                "id": "C379D106C9DF49408628266184B229B8",
                "rn": 4,
                "my-lbxz": "0"
            },
            {
                "cs": 62,
                "tjzb": "系统-权限-其他权限",
                "id": "9E46CBF1B34E458E9E24E9DA88F5ABA9",
                "rn": 5,
                "my-lbxz": "0"
            },
            {
                "cs": 58,
                "tjzb": "系统-数据管理-个人笔记-展示",
                "id": "E0842B6B744D4A32A279E5F0D8361AF9",
                "rn": 6,
                "my-lbxz": "0"
            },
            {
                "cs": 51,
                "tjzb": "系统-权限-用户信息-默认登陆",
                "id": "8CFDFA90CF474CF6AA11D8811F3733AA",
                "rn": 7,
                "my-lbxz": "0"
            },
            {
                "cs": 36,
                "tjzb": "系统-权限-权限信息-默认菜单",
                "id": "DD811C0C47584583A26F4F56EF16629A",
                "rn": 8,
                "my-lbxz": "0"
            },
            {
                "cs": 26,
                "tjzb": "系统-数据管理-文档资料",
                "id": "DB7A417A3AC74ED9A0B41ABEF10C03C0",
                "rn": 9,
                "my-lbxz": "0"
            },
            {
                "cs": 18,
                "tjzb": "系统-数据管理-统一字典",
                "id": "21C74221753145F6A3B690042E0B563A",
                "rn": 10,
                "my-lbxz": "0"
            }
        ]
    },
    "legend": {
        "type": "scroll",
        "orient": "vertical",
        "right": 10,
        "top": 20,
        "bottom": 20
    },
    "grid": {
        "left": "10%",
        "right": "4%",
        "bottom": "3%",
        "containLabel": true
    },
    "tooltip": {
        "trigger": "item"
    },
    "xAxis": {
        "axisLabel": {
            "interval": 0,
            "rotate": 45
        },
        "type": "category"
    },
    "yAxis": {
        "type": "value"
    },
    "series": {
        "encode": {
            "x": "tjzb",
            "y": "cs",
            itemId:'id'
        },
        "label": {
            "show": true,
            "position": "top",
            "valueAnimation": true
        },
        "type": "bar"
    },
    "title": {
        "x": "center",
        "text": "系统-日志-访问日志-模块统计"
    }
};