json_object and error ora 01006 bind variable does not exist (4334254)

The script below returns an error when running it in the Toad editor:

DROP TABLE json_documents PURGE;
CREATE TABLE json_documents (id NUMBER, data VARCHAR2(4000), CONSTRAINT json_documents_is_json CHECK (data IS JSON));
INSERT INTO json_documents (id, data) SELECT rownum, JSON_OBJECT( 'EMPNO' : empno, 'ENAME' : ename, 'JOB' : job ) FROM emp;

The error is

>> INSERT INTO json_documents (id, data)
SELECT rownum, JSON_OBJECT( 'EMPNO' : empno, 'ENAME' : ename, 'JOB' : job ) FROM emp
Error at line 10
ORA-01006: bind variable does not exist

WORKAROUND 

Use 

INSERT INTO json_documents (id, data) SELECT rownum, JSON_OBJECT( 'EMPNO' value EMPNO, 'ENAME' value ename, 'JOB' value job ) FROM EMP;

instead of

INSERT INTO json_documents (id, data) SELECT rownum, JSON_OBJECT( 'EMPNO' : empno, 'ENAME' : ename, 'JOB' : job ) FROM emp;

STATUS

Waiting for fix in a future release of Toad for Oracle