In the HTML comment used to render the green bars in the page editor, we lack the possibility to add the icons and styles elements attributes used by live-copy for instance.

The current template annotation handler:

https://git.magnolia-cms.com/projects/MODULES/repos/frontend-helpers/browse/packages/template-annotations/src/service/TemplateAnnotations.js

The live-copy custom element attribute:

https://git.magnolia-cms.com/projects/ADDON/repos/live-copy/browse/src/main/resources/livecopy/decorations/templating/config.pageEditorAttributes.component.icons.yaml

To summarize, live-copy use 2 attributes of the current component JCR node to create 2 additional attributes in the component edition bar (icons and styles). Currently we have no way to set those attribute properly by using the SPA renderer.