Asking because I use "load as placeholder" to save objects into memory without instancing them, then later I instance many of them.
I don't think this exists as a built-in option, but you may be able to use a tool script attached to the instanced scene to achieve this (or an editor plugin).
tool
This class looks like it might help you. https://docs.godotengine.org/en/stable/classes/class_instanceplaceholder.html
