How to claim refund for US-Japan Tax treaty benefit on J1

I was a J-1 holder from January to August 2019 then became permanent resident afterwards. Failed (forgot) to request for tax treaty benefit through my university so I had deductions (Federal tax and State tax) on my earning during those period when I was on J-1 visa. 

I am going to file tax jointly with my husband (who is US citizen) for 2019. How can I claim refund for the tax treaty benefit with Turbotax deluxe? Thanks.