// Complex return type: serialize to JSON and return as *u8 (NUL-terminated C string).
// The caller owns the returned pointer; they must free it via the C API.
// For now, return null to indicate the method is not yet implemented.
// Unsupported: JSON serialization for this complex return type.
_ = {{ ok_binding }};
if (out_result) |ptr| ptr.* = null;
return 0;