I don't have the full context of what you're trying to model, but "two components deployed as one service" might be better represented as a container. If that's not the case, you can use the "group" concept to group components together -> https://docs.structurizr.com/dsl/cookbook/groups/

Alternatively, https://likec4.dev provides a way to create an arbitrary number of abstraction levels (although I wouldn't recommend such an approach).