By System Architecture I mean the computational components of the software system and interactions/relationship among those components. The components may be tasks, processes, objects or modules etc. Different components are connected by connectors(procedure call, implicit invocation, message passing, instantiation, shared database etc).
I have generated UML diagrams via reverse engineering using Visual Paradigm, but can I also generate Architecture?
Since components and interactions can be not explicit in code in general case you can not generate such diagram automatically. You should study different aspects of your application: source code, existing documentation, user interface, configuration, jira tasks, etc and try to restore the original architecture.