There is no stimulus credit on a 2019 tax return. It will be on the 2020 tax return you file next year.
IRS website stimulus FAQ's (Question 31) - https://www.irs.gov/coronavirus/economic-impact-payment-information-center#calculating
If you did not receive the full amount to which you believe you are entitled, you will be able to claim the additional amount when you file your 2020 tax return. This is particularly important for individuals who may be entitled to the additional $500 per qualifying child payments. We encourage everyone to review our “How do I calculate my EIP” question and answer (See question 24).
