Simulink: Adding 3x3 matrix to block mask icon

Hi guys,

Is there any way to create a matrix like this on a block mask? I know I can add an image but I want to create it in the Icon drawing commands tab in the mask editor. I tried to use disp, text, fprintf commands mentioned in here but I couldn't achieve it.

[Swarooph]

Using disp gives me a nice matrix. However it does miss the brackets.

Can you specifically say you need the brackets?

[theShield]

Yes, not only brackets but also I want superscripts and subscripts too.