sahamanish,
Unfortunately, in your situation you do not get the SDI refunded through your CA income tax return. That mechanism is only for the case when multiple employers withheld more than the state's limit on SDI contributions. See https://www.ftb.ca.gov/refund/help-refund.html
Instead, your employer is the one who owes you the SDI and they, in turn, need to contact CA EDD and request a refund of the excess tax they paid. See https://edd.ca.gov/Payroll_Taxes/How_to_Correct_Prior_Reports_or_Deposits.htm for the instructions they should follow.
Good luck! You'll probably need it. With the pandemic, the EDD is overwhelmed.
