Percentage offset

[EskelCz]

Thanks for this awesome library! I have a feature request.

I'm adding a text of a user defined length, which I need to be centred in the viewport, therefore I need to set the offsetX to half of the width.

That in svelte is pretty convoluted, as I have to have an $effect to watch for the moment of the shape being added (I could use a konva effect here), then get the handle and calculate and set the offset.

Instead it could be as simple as <Text offsetX='50%' /> with a support for percentages. I feel it would be generally useful.
Thanks for your consideration.