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rl_json
Extends Tcl with a json value type and a command to manipulate json values directly. Similar in spirit to how the dict command manipulates dictionary values, and comparable in speed
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Technically, Tcl's internal type system is that all other value types are subtypes of string, universally serializable to string, and will correctly round-trip through string. But it also means that you can type-pun stuff if you want; it just costs time.
FWIW, the best handling I know of JSON in Tcl is the rl_json package (https://github.com/RubyLane/rl_json) which essentially makes JSON into what works like a native Tcl value type.