> I have no idea what you are asking.
>
> > The reason is I have to put those values inside a comment,
> > so I cannot pass them as variables.
>
> So your original query about accessing property values from src blocks was
> not what you wanted?
>
> Examples of what one is trying to do - even if they do not work exactly as
> intended - are often more helpful than verbal explanations of what one
> would like to do.
>
> Chuck
>

I'm sorry if my explanation was not clear, but the original example I provided shows exactly what I wanted to do:

* Subtree
:PROPERTIES:
:DUMMY: VALUE
:END:

#+BEGIN_SRC

{{DUMMY}} <- something like this?

#+END_SRC

Basically, I want to replace {{DUMMY}} with VALUE, without passing it as a variable. So just like <<noweb>> replacement, but with a property value instead of a code block. 
I get the feeling that this is not possible, but I wanted to ask just in case. 

Best,
Joon