Well done!
Notes:
1. You can write
when compress(Value, ,'kd')=Value then 'num'
as
when compress(Value,'+-.','kd')=Value then 'num'
to capture decimals and negative numbers.
2. You can write
JSON_output=cat("$$", repeat(" ", &i-1), '"', strip(P&i), '"', ": {");
as
JSON_output=cat("$$", repeat(" ", &i-1), quote(strip(P&i)), ": {");
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