Is there a way to rotate the textblock?

I have a graph object with a side panel.

I would like to fit a text box into the side panel and have it rotated so that the user inputs text from bottom to top. Is there a way to do this easily? If there isn’t a way with the current goJS functionality, would it be possible to extend the Textblock class to allow this behavior?

You might want to look at some of the samples, such as: