do you need to address that in your cover letter? the cover letter might be first thing they look at to decide which cv s to look at. i would be more inclined to focus on how you fit the role in the cover letter.
i heard a speaker talk about how he assesses job applications. one thing that he was interested in was the 'interests' section at the end. i always assumed this was just a fluff bit, but he said that if he read a person was a volunteer or part of a committee (kinder/school/local community), their application went higher up the pile because it showed they were willing to put themselves out there and learn skills needed for the job that was in front of them. if you have any role like this in the past years, make a feature of it, think of the skills that you learnt or needed to do the role.
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