Same kind of mechanism was actually used for Lightbox, see: https://github.com/xwiki/xwiki-platform/blob/xwiki-platform-16.1.0/xwiki-platform-core/xwiki-platform-image/xwiki-platform-image-lightbox/xwiki-platform-image-lightbox-webjar/src/main/webjar/lightbox.js#L101 and https://github.com/xwiki/xwiki-platform/blob/xwiki-platform-16.1.0/xwiki-platform-core/xwiki-platform-image/xwiki-platform-image-lightbox/xwiki-platform-image-lightbox-ui/src/main/resources/XWiki/Lightbox/WebHome.xml#L480