Canvas does not list itsLearning among the options for the Course Import tool, and I looked at the itsLearning support site and don't see an option there to export an entire course anyway. I'm sorry it's not any easier than selectively downloading files and importing them into Canvas and manually re-creating the course settings and structure. I suggest two options to make it easier in the future: one is to encourage itsLearning to create an export function, and the other is to propose an idea that Canvas add itsLearning to its list of importable export files. I don't know the process for making suggestions to itsLearning, but the Instructure Community has an entire section on user-suggested ideas for improvement (note that the idea process is currently on pause as it is being refined):
Idea Conversations - Instructure Community
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