How to write local code using a TLC custom storage class

I'm trying to create a class that yields the following behavior:

1. Declare a local struct and fill its fields with data.
2. Pass that struct to an API. This API doesn't change.

I managed to do something close do it by creating a storage class TLC:

/* Definition of data with custom storage class HblLoad */
static MY_LOAD_REQUEST_STRUCT Hbl_Request;

/* Model step function */
void HblStorageClassTest_step(int32_T arg_Arg01, int32_T arg_Arg02)
{
  int32_T rtb_Sum;

  /* Sum: '<S2>/Sum' incorporates:
   *  Inport: '<Root>/Arg01'
   *  Inport: '<Root>/Arg02'
   */
  rtb_Sum = arg_Arg01 + arg_Arg02;

  /* BusCreator: '<S2>/Bus Creator' incorporates:
   *  Constant: '<S3>/Constant'
   *  DataStoreWrite: '<S1>/Data Store Write'
   *  RelationalOperator: '<S3>/Compare'
   */
  Hbl_Request.Int_Field = rtb_Sum;
  (void)Hbl__SetLoadRequestByLoadID(LOAD_ID, PRIORITY, (uint8*)&Hbl_Request);
  Hbl_Request.Bool_Field = (rtb_Sum <= 0);
  (void)Hbl__SetLoadRequestByLoadID(LOAD_ID, PRIORITY, (uint8*)&Hbl_Request);
}

But this is still not quite right. My final objective is having something like this:

void HblStorageClassTest_step(int32_T arg_Arg01, int32_T arg_Arg02)
{
  int32_T rtb_Sum;
  MY_LOAD_REQUEST_STRUCT Hbl_Request;

  rtb_Sum = arg_Arg01 + arg_Arg02;

  Hbl_Request.Int_Field = rtb_Sum;
  Hbl_Request.Bool_Field = (rtb_Sum <= 0);
  
  (void)Hbl__SetLoadRequestByLoadID(LOAD_ID, PRIORITY, (uint8*)&Hbl_Request);
}

What modifications do I need to do in my TLC to get this working? I'm sending attached the model and storage class. Please open HblStorageClassTest.slx.

Thanks!