Hey,
I'm not sure this is the good way to do it, but you can store in your labelModel a Text instead of a String:
myComposableModel label text: 'someString' asText.
Then you can add attribute to the text:
myComposableModel label text addAttribute: TextColor red.
myComposableModel label text addAttribute: TextAlignment rightFlush.
Try first with TextColor red, because for TextAlignment rightFlush there might be other reason it does not work�
(i.e. the label model has the width of the text, so modifying the alignment will not modify anything).
Best,