should be it

external/duckdb/extension/json/CMakeLists.txt

@@ -0,0 +1,48 @@
+cmake_minimum_required(VERSION 2.8.12...3.29)
+
+project(JSONExtension)
+
+include_directories(include)
+add_subdirectory(json_functions)
+
+set(JSON_EXTENSION_FILES
+    json_reader.cpp
+    json_extension.cpp
+    json_common.cpp
+    json_enums.cpp
+    json_functions.cpp
+    json_multi_file_info.cpp
+    json_scan.cpp
+    json_serializer.cpp
+    json_deserializer.cpp
+    serialize_json.cpp
+    json_functions/copy_json.cpp
+    json_functions/json_array_length.cpp
+    json_functions/json_contains.cpp
+    json_functions/json_exists.cpp
+    json_functions/json_extract.cpp
+    json_functions/json_keys.cpp
+    json_functions/json_merge_patch.cpp
+    json_functions/json_pretty.cpp
+    json_functions/json_table_in_out.cpp
+    json_functions/json_structure.cpp
+    json_functions/json_transform.cpp
+    json_functions/json_create.cpp
+    json_functions/json_type.cpp
+    json_functions/json_valid.cpp
+    json_functions/json_value.cpp
+    json_functions/json_serialize_sql.cpp
+    json_functions/json_serialize_plan.cpp
+    json_functions/read_json.cpp
+    json_functions/read_json_objects.cpp)
+
+build_static_extension(json ${JSON_EXTENSION_FILES})
+set(PARAMETERS "-warnings")
+build_loadable_extension(json ${PARAMETERS} ${JSON_EXTENSION_FILES})
+target_link_libraries(json_loadable_extension duckdb_yyjson)
+
+install(
+  TARGETS json_extension
+  EXPORT "${DUCKDB_EXPORT_SET}"
+  LIBRARY DESTINATION "${INSTALL_LIB_DIR}"
+  ARCHIVE DESTINATION "${INSTALL_LIB_DIR}")