Here is a recurring question that we have answered in depth a few times over, on binding a shared parameter to a given category, so the answer mainly consists of pointers to past discussions:
Is there an example to add a shared parameter to a Revision record?
How do I add more information to the Revision record in the parameters?
Afaict from experiments in the distant past, you can add a shared parameter to almost any category.
Does a category exist for revisions?
If you don't know off-hand, you can tell in several different ways:
I did the latter, looked at
the BuiltInCategory enumeration documentation.
That shows me that the built-in category OST_Revisions exists, so all is well so far.
Next, I suggest you check out the ADN Xtra labs.
Of special interest in your case is the external command Lab4_3_1_CreateAndBindSharedParam in the module Labs4.cs that shows how to create and bind a shared parameter.
As you can see from
the comments on that command,
I have used it repeatedly in the past to test creating a shared parameter for various categories, both built-in ones such as OST_Revisions and dynamically generated ones, such as for an imported DWG file.
Search The Building Coder blog posts for Lab4_3_1_CreateAndBindSharedParam to see detailed discussions of some of those experiments:
Once you have ascertained that you can bind a shared parameter to the category of interest, I assume your next question will be how to do so in a simple and efficient manner.
I implemented one approach for the ExportCncFab add-in.
It is discussed in three posts by The Building Coder, listed in the topic group on splitting an element into parts.
The third of those explores and implements binding and storing shared parameter data.