Remember T4A doesn't count, T4A is self-employed or contractor in CIC's definition, even you worked as an employee. for your community services job, did they deduct any tax, EI and CPPI currently have one job right now. For 2016,2017 & 2018, I had at least two jobs. Yes I have job duties, job letter and T4A from 2017 and 2018 for one of the two jobs I had in 2017-2018 while the other one I have T4,ROE. Job letter, job offer letter and job duties. I only have the full documentation for only two jobs because the other jobs were either just summer jobs like fundraising or were temp roles placed by employment agencies or one of them is now a defunct employer but I have the T4 for that one too.
If i understand you correctly, you mean you claim two jobs, one is admin assistant for 1 year and the other one is your current job community service?
If you claim point for your job and you provide reference letter (better with T4 and Paystub as supporting documents) then you should good to go. If you don't claim point, then just put it on personal activity without proof.