Virtually prefix headlines according to content

[Rodrigo Morales]

* The context

When taking notes in Org Mode, I usually store Github links of the
repositories that are relevant to the topic I'm taking notes as
headlines. For this reason, I've multiple headlines of the form within
my notes (from my notes on Graph Theory):

#+BEGIN_SRC org
* cytoscape/cytoscape.js: Library for visualisation and analysis
:PROPERTIES:
:GITHUB: cytoscape/cytoscape.js
:END:

* simongray/clojure-graph-resources: List of Clojure resources
:PROPERTIES:
:GITHUB: simongray/clojure-graph-resources
:END:

* DONE What is an undirected graph? ...
* DONE What is a directed graph? ...
#+END_SRC

* The question

What I would like to know is whether it is possible to format a headline
by taking into consideration the properties it has. For example, in this
specific scenario, I would like to make all headlines that have a
"GITHUB" to show "GH" before the actual headline (the content would look
like this).

#+BEGIN_SRC org
* GH cytoscape/cytoscape.js: Library for visualisation and analysis ...
* GH simongray/clojure-graph-resources: List of Clojure resources ...
* TODO What is an undirected graph? ...
* TODO What is a directed graph? ...
#+END_SRC

The reason why I'm asking this is because thus when collapsing
headlines, I would know that an specific headline is a Github
repository. In general terms, to ease the readibility of my Org Mode
file.

* Additional context

A similar behavior is provided by org-num-mode (built-in function), so I
guess that some way to accomplish this would be to look at the
implementation of that mode and try to understand how that is
accomplished.

Any help is appreciated,
Rodrigo Morales.