How to modify existing marker shape (triangle to upside down triangle)?

Regarding Apexcharts: How can I create a new shape or modify the existing triangle shape to be upside down?

markers: {
    size: 0,
    colors: undefined,
    strokeColors: '#fff',
    strokeWidth: 2,
    strokeOpacity: 0.9,
    strokeDashArray: 0,
    fillOpacity: 1,
    discrete: [],
    shape: "triangle",
    offsetX: 0,
    offsetY: 0,
    onClick: undefined,
    onDblClick: undefined,
    showNullDataPoints: true,
    hover: {
      size: undefined,
      sizeOffset: 3
    }
}