SQL Developer for VS Code

The following statement works in Oracle Database 23ai but produces a syntax error in the VS Code extension 24.3.1.

select json_transform(
          '{"a":[1,2,3,4,5,6,6], "b":[4,1,3,5,7]}',
          union '$.a' = path '$.b[0 to 4]' format json
          ignore on missing
          error on mismatch
          ignore on null
       );

Here's the screenshot showing the complete error message: