With Mermaid, the usage seems very locked down to a handful of use cases. I want to be able to point a method of a classDiagram at a decision chart with arrows

With Mermaid, the usage seems very locked down to a handful of use cases. I want to be able to point a method of a classDiagram at a decision chart with arrows then to the row of a database table. This is the sort of thing I reach to either Graphiviz or for Omnigraffle currently, and this doesn't seem to solve. With Mermaid each type of diagram is distinct and locked down to specific intended uses.