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preview --json is just the summary diff displayed as json
a plan export is a much richer data structure that includes far more than a preview diff to allow the engine to constraint later updates to do the same thing as the preview

How can i get just the summary diff in json from the Automation API?

It would be nice if infracost could parse over the plan export… but it doesn’t seem to

or could i convert from the plan format into the preview format somehow?

I don't think this is exposed by automation api at the moment

It's come up a few times, something we need to look into. I do have a plan for a whole overhaul of automation api, but it's big work and hard to find time to do it

That will give you a stack that's deployed, not a preview result

For now i’m breaking out into a shell command to do what i need instead of using automation api… fine for a prototype but definitely very interested in seeing the Automation API overhaul!