bar series under polar coordinate cant show label property

[robothn2]

Version

5.0.2

Steps to reproduce

in example editor, input follow codes:

option = {
    angleAxis: {
        type: 'category',
        axisLine: {show: false},
        axisTick: {show: false},
        splitLine: {show: true, lineStyle: {type: 'dashed' }},
        axisLabel: {color: 'blue'},
        data: ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J'],
    },
    radiusAxis: {
        type: 'value',
        axisLine: {show: false},
        axisTick: {show: false},
        axisLabel: {show: false},
        splitLine: {width: 1, lineStyle: { type: 'dashed' }}
    },
    polar: {},
    series: [{
        type: 'bar',
        barCategoryGap: 1,
        label: { show: true, position: 'insideTop', color: 'cyan', formatter: '{c}' },
        itemStyle: { color: 'red', opacity: 0.30},
        data: [6000, 5900, 5300, 5012, 5110, 2387, 3277, 2373, 1238, 1000],
        coordinateSystem: 'polar',
    }]
};

What is expected?

bar label shown as it under cartesian coordinates

What is actually happening?

no any label shown

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