For better understand of release notes explain details with one demo project.
HI @yuvaraju
Welcome to the community!
I don't think so you will get a Demo from anyone. For details, you need to refer the release notes of the specific products like Jira Software, Service Desk..and so on
https://confluence.atlassian.com/jirasoftware/jira-software-release-notes-776821069.html
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