How to use the @nivo/radar.RadarDefaultProps.keys function in @nivo/radar

`,
        type: 'string | number',
        required: false,
        defaultValue: defaults.indexBy,
    },
    {
        key: 'keys',
        group: 'Base',
        help: 'Keys to use to determine each serie.',
        description: `
            Keys to use to determine each serie.
            Those keys should exist in each data item.
        `,
        type: 'Array',
        required: false,
        defaultValue: defaults.keys,
    },
    {
        key: 'maxValue',
        help: 'Maximum value.',
        description: `
            Maximum value, if 'auto',
            will use max value from
            the provided data.
        `,
        required: false,
        defaultValue: defaults.maxValue,
        type: 'number | string',
        controlType: 'switchableRange',
        group: 'Base',
        controlOptions: {
            disabledValue: 'auto',