Define a constant that is use in query/filter on the page

[Stefan Flink]

Hej 

I have read the postings about variables on confluence pages but can not see that it resolve my need. 

What I like to create is a dynamic product roadmap that extract info from Jira. Roadmap is build as a table where columns are time and the rows are areas of the product. In each cell I place a Jira Filter that extract the data based on column and row. 

So, it would be super to be able to define the row and column as constants/valiables that I can use in the filter. Thus when time flies (as it seems to do) I can just update the constants/valiables and not go into each cell. I also would like to display the value of the constant/valiable in the heading of the table. 

Anyone that have have any idea on this?