add multiple artwork to multiple m4a ...

Hello,
I am trying to figure out how to add several covers to a few track at once (ALAC format means m4a). I know that the feature can be used in iTunes for one track, but it's disgusting to do it one by one, instead I would like to use it for several tracks at once. I am using Tagr for my MP3 files and to add several images. That's working well, but there is any m4a implementation for that app.
Any ideas??

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