[Mojolicious] Can I get a return value outside of Promise?

[Dingbing Liw]

Hi, all.
I am refactoring my mojolicious app.
Is there any way to use promise and keep the same return value?
For example:

My original  method:
sub some_method {
  my $a = block_function_a();
  my $b = block_function_b();
  my $c = block_function_c();  ### for example many Mojo::Pg search 
  return $a+$b+$c;
}

Now I change block_function_c to  an unblocked promise.

sub some_method {
  my $a = block_function_a();
  my $b = block_function_b();
  return promise_mojo_db_search->then(sub($c){  
       $a+$b+c;
   }
);
}

I have to change many relative code after the return value change.
It is very annoying.
Is there any way to return the same value with promise.

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