How to use the @nivo/heatmap.HeatMapDefaultProps.labelTextColor function in @nivo/heatmap

controlType: 'switch',
        controlGroup: 'Labels',
    },
    {
        key: 'labelTextColor',
        scopes: '*',
        description: (
            <span>
                how to compute label text color,{' '}
                see dedicated documentation.
            </span>
        ),
        help: 'Method to compute label text color.',
        type: '{string|Function}',
        required: false,
        default: defaults.labelTextColor,
        controlType: 'color',
        controlGroup: 'Labels',
        controlOptions: {
            withCustomColor: true,
        },
    },
    ...marginProperties,
    {
        key: 'enableGridX',
        scopes: '*',
        description: 'Enable/disable x grid.',
        type: '{boolean}',
        required: false,
        default: defaults.enableGridX,
        controlType: 'switch',
        controlGroup: 'Grid &amp; Axes',

type: 'boolean',
        required: false,
        defaultValue: defaults.enableLabels,
        controlType: 'switch',
        group: 'Labels',
    },
    {
        key: 'labelTextColor',
        help: 'Method to compute label text color.',
        description: `
            how to compute label text color,
            [see dedicated documentation](self:/guides/colors).
        `,
        type: 'string | object | Function',
        required: false,
        defaultValue: defaults.labelTextColor,
        controlType: 'inheritedColor',
        group: 'Labels',
    },
    {
        key: 'enableGridX',
        help: 'Enable/disable x grid.',
        type: 'boolean',
        required: false,
        defaultValue: defaults.enableGridX,
        controlType: 'switch',
        group: 'Grid & Axes',
    },
    {
        key: 'enableGridY',
        help: 'Enable/disable y grid.',
        type: 'boolean',