Write to Arduino Analog pins from Simulink

I'm trying build and deploy simulink models to Arduino Uno using the "Simulink support package for Arduino hardware". I need to change the pin mode of pin "A0" to output and wirte to it. I know it's possible using the "Matlab support package" but the "Digital Output" block in the Simulink package doesn't seem to accept anything other than an integer between 0-13 for pin number.

If it's impossible, any hacks would be welcome (like calling the matlab function from Simulink etc. )

Thanks in advance for your answers