@Naga jyothi sri Agent Assist can to my knowledge be added to any contextual side panel, but it will require understanding and knowledge of how UI Builder works.
This is the Employee Center community, if you want you can drop your question to the below Next Experience community, which covers things like Configurable Workspaces and UI Builder 🙂
https://www.servicenow.com/community/next-experience/ct-p/next-experience
