Write SQL query to solve given problem: How many levels are there left for Diego W Roel to reach if he/she could go to the max level for his/her position?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.max_lvl - T1.job_lvl FROM employee AS T1 INNER JOIN jobs AS T2 ON T1.job_id = T2.job_id WHERE T1.fname = 'Diego' AND T1.minit = 'W' AND T1.lname = 'Roel'