Yes, using lists:

Result looks like this:

@Alexander Heinze Is there a way to add more than one value for a label. Example would be if I had one label I wanted called “Full Name” and I wanted the value to be a combination of a firstname field and lastname field. Is that possible?

Not aware of such an option, tried “+” and “&” without success. You could combine attributes in the upstream system and send them as additional attributes, but these have a performance impact and I doubt that the added benefit would justify that.