This is almost exactly the tool I have wanted for a long while.
The one thing is when something is drawn in the interactive UI, rather than becoming a single node which cannot be decomposed/worked with via sub-elements, it should become (or there should be an option for) "ungrouping" it to an equivalent set of nodes/values --- if this capability is present, I couldn't figure it out, and I'd be glad to know of it.
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