Understanding UIExtensionClass "Context Elements" and passing parameters to target page

I’m currently starting XWiki development, initially with a UIExtensionClass Admin Action menu point but still have some understanding problems or missing more documentation after reading …

• https://extensions.xwiki.org/xwiki/bin/view/Extension/UIExtension%20Module
• https://www.xwiki.org/xwiki/bin/view/Documentation/DevGuide/ExtensionPoint/Admin%20Actions
• https://extensions.xwiki.org/xwiki/bin/view/Extension/Rendering%20Module/Async/#HStandardcontextentries

Question 1: What exactly are the “Context Elements” I can select when creating a UIExtensionClass and how/where (in the Class code vs on the target page) to access them?

Question 2: In my case I create an additional Admin Menu entry. The target page needs the information which page was calling, what is the best practice to pass this information to the target page? Initially I used a url parameter but I think some kind of context usage would be better?

{{velocity}}{{html clean="false"}}
  #template('menus_macros.vm')
  #set($customUrl = "/xwiki/bin/view/Scratch/UixAdminAction?doc=" + $doc.fullName)
  #submenuitem($customUrl, "UixAdminAction", "UixAdminActionId", "UixAdminActionClass", "icon")
{{/html}}{{/velocity}}

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