I have read on the forum that this is an option, but I would additionally try to:
1- get a letter from your direct supervisor (if u have a good relationship with them) stating your duties and the duration of your employment.
2- add a payroll document or email to submit your salary and benefits
3- your signed contract as well? if it includes your duties it would be great.
If that company is not in the NOC your r applying for I wouldnt worry much and focus on the ones that fall in your NOC. If it does, try to include any documentation stating your duties and start and end dates. And of course, you will definitely need a letter of explanation.
In my case, one of the companies wouldn't include my salary. I mentioned it was against their policy in the LoE, however, it was not in the NOC I applied for so I am not sure if they accepted this explanation or just ignores it because I do not take points for it.
So, as a wrap up, try to submit the info they need from documents you already have and add an LoE along with the email the company sent you. Good luck!