No. This is an interesting problem but a non-goal for the C++ version of simdjson, which produces usable "native data structures" albeit not outside the parser (speaking informally - the structures aren't really "in the parser" but they are specific to simdjson if you see what I mean).
The reification problem is awkward but it's a different problem for each language. I did daydream of breaking some API boundaries and using SIMD to magic up some Python structures directly, but this would be incredibly brittle. Someone would probably use it but the chance of getting burned by this is... high.
