#define NLOHMANN_JSON_NAMESPACE
This macro evaluates to the full name of the nlohmann namespace, including the name of a versioned and ABI-tagged inline namespace. Use this macro to unambiguously refer to the nlohmann namespace.
The default value consists of a prefix, a version string, and optional ABI tags depending on whether ABI-affecting macros are defined (e.g., JSON_DIAGNOSTICS, and JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON).
When the macro is not defined, the library will define it to its default value.