Global Data sync variables

It would be nice to be able to set global variables when doing a data sync. For example, I could set a variable that contains data that I would like to insert into multiple rows and/or tables.

Currently we have the ability to set variable for a single sync action, not set them globally. This means that it's currently not possible to use variable across multiple tables.

Use case here is I am defining custom lists which contain a DB query and a list of columns to display. There are multiple lists for a particular module but the client would like the same columns on all the lists within a module. Rather than defined the list columns for each entry it would be nice to be able to define it once as a variable, then use that as the column data for each row.