GraphEA is the methodology and tools of keeping Enterprise Architecture in a general purpose Graph Database, like Neo4j, Janus DB etc. It was introduced to get Graph Analytics experts to assist in developing and maintaining Enterprise Architecture.
Most Enterprise Architects are competent Architects with significant knowledge of the domain and technology and years of experience, and are capable of presenting Enterprise Architecture in form of PowerPoint slides and Visio diagrams. However developing consistent graph models require different set of skills, that many Enterprise Architects lack.
There is a multitude of Enterprise Architecture tools, and your organisation has consistent, maintained repository widely used across the enterprise, you do not need GraphEA.