I’m missing the cell update binding in perspective 
now I have to create a script to create the dataset from scratch manually to accomplish the following:
Well, the closest alternative to the cell update binding would be the expression structure binding…but it’s got some real problems with arrays at the moment (I’ve filed a ticket) so I can’t wholly recommend it if you’re trying to return something directly to render on a table.
This actually is pretty much what the expression structure binding is meant to do, and it works fine with arrays, although the top level return value is always an object. A quick transform would make quick work of that though, to pull the array out of it…