velocity (VTL) release notes variables for release date, issue links and attachments

[Fabian]

Hello dear community,
I would like to edit the release notes and started to build my own vm file. So far so good.
Unfortunately I still can't find any reasonable documentation for the single possible VTL variables. Is there any at all?
I could only find information about a few variables here in the forum:
https://community.atlassian.com/t5/Jira-questions/Jira-Release-Notes-Template-Documentation/qaq-p/45533 

Or maybe you can help me.
I still need the following information, which I want to display in my releasenotes.vm file:
- the release date
- the individual links on the respective issue
- And if possible, links to the attachments on the respective issue.

You would help me a lot with this.
Thank you very much.

[Fabian]

Is there noone who can help me?