Simulink.Bus objects as unions

Is it possible to use Simulink.Bus objects with internal unions as in C code? The purpose would be to simplify stateflow code which needs to turn on/off multiple outputs without having to explicitly state each individual item.

Struct/union example:

   struct {
      uint8_t leds;
      union {
         led0:1;
         led1:1;
         led2:1;
         led3:1;
         led4:1;
         led5:1;
         led6:1;
         led7:1;
      }
   }