> 
> Usually, you get subtree specific variables with node properties,
> appending "EXPORT_" to them, e.g.
> 
>   * Subtree root
>   :PROPERTIES:
>   :EXPORT_AUTHOR: Not me
>   :END:
> 
> > I have been using #+MACRO: but it seems it is a buffer-wide thing.
> 
> The suggestion above doesn't apply to MACRO keyword, mainly because
> properties' values are only one line long.
> 

Thank you for the reply. I'm aware of EXPORT_ stuff, but I'm actually looking for something like this:
* Subtree root
:PROPERTIES:
:EXPORT_Variable: Test:END: 
{{{Variable}}}
Would something like this be possible?
Best,Joon