There's a JSON format of the blueprints that you can see when you copy/paste. Its just a bit ambiguous than the usual binary format. Its not an impossible problem at all.
Not an impossible problem only in theory. It's currently practically impossible and will take at least a year to solve if anybody starts to work on this at all.
Since my current project does involve wrangling AI to do stuff - forcing it to output a consistent, complete, large JSON with an exact specific format is very difficult and takes a lot of time (you won't be able to draw Blueprints line by line to show to the user that AI is processing). Definitely no autocomplete-like experiences maybe ever.
For example, look at the text representation of these 6 (!) nodes:
And the second even bigger problem: On forums and basically everywhere all users share screenshots with descriptions. There's not enough training data for anything meaningful.
I tried to force copilot/gpt to output even a small sample of copy-pastable blueprint and it just can't.