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

type: 'number',
        required: false,
        defaultValue: defaults.gridLevels,
        controlType: 'range',
        group: 'Grid',
        controlOptions: {
            min: 1,
            max: 12,
        },
    },
    {
        key: 'gridShape',
        help: 'Determine shape of the grid.',
        type: 'string',
        required: false,
        defaultValue: defaults.gridShape,
        controlType: 'choices',
        group: 'Grid',
        controlOptions: {
            choices: [
                { label: 'circular', value: 'circular' },
                { label: 'linear', value: 'linear' },
            ],
        },
    },
    {
        key: 'gridLabel',
        type: 'Function',
        group: 'Grid',
        help: 'Grid label.',
        description: `
            An optional function to override label rendering.