Constant value in Blackboard

I require a const list with (at least) strings in it.
The full situation is, that I will be making a lot of different BTs for different enemies, and each has a unique set of interactions it can perform. To be able to implement a generic “Complete Interaction” Task, I will need to pass a list of some sort which tells the task which interactions are possible. Therefore, I think what I need is a constant list which contains this information. Any tips or ideas on how to achieve this?