How to use the @nivo/bar.BarDefaultProps.label function in @nivo/bar

You can also use a funtion if you want to
            add more logic, this function will receive
            the current bar's data and must return
            the computed label which, depending on the context,
            should return a string or an svg element (Bar) or
            a string (BarCanvas). For example let's say you want
            to use a label with both the id and the value,
            you can achieve this with:
            \`\`\`
            label={d => \`\${d.id}: \${d.value}\`}
            \`\`\`
        `,
        type: 'string | Function',
        required: false,
        defaultValue: defaults.label,
    },
    {
        key: 'labelFormat',
        group: 'Labels',
        help: 'How to format labels.',
        description: `
            How to format labels,
            [see d3.format() documentation](https://github.com/d3/d3-format/blob/master/README.md#format).
        `,
        type: 'string | Function',
    },
    {
        key: 'labelSkipWidth',
        help: 'Skip label if bar width is lower than provided value, ignored if 0.',
        type: 'number',
        required: false,