[O] Export of property key:value

[Edward DeMeulle]

I've been trying to get a handle on this the past couple of days since I
wanted to use column mode for revising properties and then export
(print) the subtree out showing those properties under the heading. I
understand that the exporter changed and now doesn't export the
properties drawer in total (and I think I understand why). It appears,
though, that I have to duplicate the syntax "key: {{{property(key)}}}
for every subheading. It would seem to me that the simplest solution, at
least from the users perspective, would be to have a way to specify
certain property keys to be exported for a particular subtree but I
haven't found that option yet.

This is my simple example. Is there a simpler way to export the amount
property without duplicating "amount: {{{property(amount)}}}" in every
subheading? 

#+OPTIONS: toc:nil d:t

* Buy stuff
:PROPERTIES:
:COLUMNS: %25ITEM %TODO %15amount(Amount){$}
:END:
** DONE Buy something
   :PROPERTIES:
   :amount: 1234.56
   :END:
amount: {{{property(amount)}}}

** TODO Buy something else
   :PROPERTIES:
   :ID:       db34ed38-7658-48b4-9770-9a572efcdb11
   :amount: 5445.43
   :END: