Don't worry, most students are in the same situation. What I did was to ask my supervisor and our department head for letters. In both letters I asked for emphasis on keywords on NOC code which matches research assistantship. It worked fine and I did not even provide ANY of my T forms. On both letters, my RA salary, TA, and scholarship were mentioned. Any publication, research outcome or extra help would be useful to add as well...
Take your time and prepare good letters, look around in this forum for samples and successful letters and notes. I hope this would help you.