Hi @PatrickSched ,
That's not recommended you and we have challenges making very difficult to implement (from my experience). When you access a value from an upstream action and there is more than one value, it is going to be in a loop because for each record, do these steps.
Again, my recommendation is to describe the entire flow what you are trying to accomplish and there are lots of people here that will help you and offer framework to accomplish.
Without the flow description and intent, we're just guessing.