可以在SSIS中编辑集合

I am trying to change a maintenance plan in SSIS to dynamically backup certain databases to certain places based on certain conditions... But it looks like the maintenance tasks use a collection for the selected databases list. As far as I can tell, I can't seem to manipulate a collection through an expression, nor can I seem to load up a variable to work as a collection.I am trying to change a maintenance plan in SSI