How to use default values for props in rbxts/React?

interface ICardUiProps{
  Size?: UDim2; 
  Position?: UDim2
}
export function CardUi({
  Size = UDim2.fromOffset(10000, 150), 
  Position = UDim2.fromScale(.5, .5)
}: ICardUiProps){
  return (
    <frame Size={Size} Position={Position}>
      <uistroke Thickness={2} Color={new Color3()}/>
      <UiCorner CornerRadius={new UDim(0.06)}/>
    </frame>
  )
}