Part-time side job in Canada with T4 (2 month) and full year of W2 in the US

Hi,

I am Canadian and green card holder. 

I live and work full time in the US and have received W2 from my employer for 2023. 

I also worked in Canada for two month in 2023 and received T4 (I live in border city and could move easily but worked mostly remotely).

For tax reporting, it seems clear to me on the Canadian side, as I was not resident of Canada and so I will only report the Canadian income on T4 to CRA. 

My questions is mostly on the IRS side. How to report this T4 income? Should I include it as a self-employment job? Should I put the gross or after-tax income? Could you please give me some help?

 

Thank you!