We already have community nodes, such as [Image Tools](https://flows.nodered.org/node/node-red-contrib-image-tools) that provide in-editor image previews. Currently that relies on "insider information" to inject the image into the workspace. If Node-RED were to change the internal workings of how flows are drawn, that would break the node. So we want to see how we can accommodate this type of customisation in a standard way - whilst keeping some design guidelines and control in place to ensure a good user experience.
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