This isn't currently possible unfortunately, but we will consider adding the option in future updates. http://todoist.com/Vote/showProposal/210/
I just got the e-mail about the new Karma features in ToDoist and would love to move my task management to you guys as the app looks great. With that said I'm having a hard time understanding why evernote integration has not been more of a priority. I'm sure there are others like me who joined todoist years ago only to leave because this feat does not exist.
Evernote has become many peoples central repository for information. What it doesn't have in my opinion is a great way to turn that repository into a structured workflow. ToDoIs has exactly this....these two tools should be working together.
Please let me know if this is something that is on a specific roadmap so that I can check back. If this was a feature I'd sign up as a premium member immediately and scream to the rooftop to everyone willing to listen why this is a great way to manage workflow.
PS: Zapier is ok...but it's not a substitute for this core functionality.